Claims:We claim: 1. A method for transmitting an Orthogonal Frequency Transition Modulation (OFTM) signal, comprising: receiving, by a transmitter, data comprising a plurality of bits, for transmitting over a channel; determining, by the transmitter, a plurality of carrier signals for corresponding predefined number of bits of the data, wherein each of the plurality of carrier signal is an Orthogonal Frequency Transition Modulation (OFTM) signal comprising a combination of at least one frequency selected from a group of a combinations of plurality of frequencies, wherein each of the plurality of frequencies are orthogonal to each other over a fundamental time period; and generating, by the transmitter, each of the OFTM signal determined for the corresponding predefined number of bits of the data for transmitting over the channel. 2. The method as claimed in claim 1, wherein a smooth transition occurs between each of the at least one frequency in the combination of the at least one frequency. 3. The method as claimed in claim 2, wherein the smooth frequency transition is a transition of a half cycle of a first frequency from the plurality of frequencies, to a half cycle of a second frequency from the plurality of frequencies. 4. The method as claimed in claim 1, wherein the group of combinations is determined based on number of the plurality of frequencies. 5. The method as claimed in claim 1, wherein each of the plurality of frequencies has a constant predefined peak power or constant power envelop. 6. The method as claimed in claim 1, wherein the plurality of frequencies is formed from a single frequency band. 7. The method as claimed in claim 1, wherein the data comprises at least one of data bits and control bits. 8. The method as claimed in claim 7, wherein the data bits and the control bits have a predefined number of bits. 9. A transmitter for transmitting an Orthogonal Frequency Transition Modulation (OFTM) signal, comprising: an input interface for receiving data comprising a plurality of bits; and a processor to determine a plurality of carrier signals for corresponding predefined number of bits of the data, wherein each of the plurality of carrier signal is an Orthogonal Frequency Transition Modulation (OFTM) signal comprising a combination of at least one frequency selected from a group of combinations of plurality of frequencies, wherein each of the plurality of frequencies are orthogonal to each other over a fundamental time period; and an oscillator to generate each of the OFTM signal determined for the corresponding predefined number of bits of the data for transmitting over the channel. 10. The transmitter as claimed in claim 9, wherein a smooth transition occurs between each of the at least one frequency in the combination of the at least one frequency. 11. The transmitter as claimed in claim 10, wherein the smooth frequency transition is a transition of a half cycle of a first frequency from the plurality of frequencies, to a half cycle of a second frequency from the plurality of frequencies. 12. The transmitter as claimed in claim 9, wherein the group of combinations is determined based on number of the plurality of frequencies. 13. The transmitter as claimed in claim 9, wherein each of the plurality of frequencies has a constant predefined peak power or constant power envelop. 14. The transmitter as claimed in claim 9, wherein the plurality of frequencies is formed from a single frequency band. 15. The transmitter as claimed in claim 9, wherein the data comprises at least one of data bits and control bits. 16. The transmitter as claimed in claim 15, wherein the data bits and the control bits have a predefined number of bits. 17. A method for receiving an Orthogonal an Orthogonal Frequency Transition Modulation (OFTM) signal, comprising: receiving, by a receiver, a plurality of Orthogonal Frequency Transition Modulation (OFTM) signals, wherein each of the plurality of OFTM signals comprises a carrier signal and corresponding predefined number of bits of data, wherein the carrier signal is a combination of at least one frequency selected from a group of combinations of plurality of frequencies, wherein each of the plurality of frequencies are orthogonal to each other over a fundamental time period; and determining, by the receiver, the predefined number of bits of data based on the combination of the at least one frequency. 18. The method as claimed in claim 17, wherein each combination of the at least one frequency corresponds to the predefined number of bits of the data. 19. The method as claimed in claim 17, wherein the plurality of OFTM signals are analog signals. 20. The method as claimed in claim 17, wherein the OFTM signals are demodulated using one of a matched filed, a correlation filter, a digital filter. 21. A receiver for receiving an Orthogonal Frequency Transition Modulation (OFTM) signal, comprising: an input interface, to receive a plurality of Orthogonal Frequency Transition Modulation (OFTM) signals, wherein each of the plurality of OFTM signals comprises a carrier signal and corresponding predefined number of bits of data, wherein the carrier signal is a combination of at least one frequency selected from a group of combinations of plurality of frequencies, wherein each of the plurality of frequencies are orthogonal to each other over a fundamental time period; and a processor to determine the predefined number of bits of data based on the combination of the at least one frequency. 22. The receiver as claimed in claim 20, wherein each combination of the at least one frequency corresponds to the predefined number of bits of the data. 23. The receiver as claimed in claim 20, wherein the plurality of OFTM signals are analog signals. 24. The receiver as claimed in claim 20, wherein the receiver demodulates the OFTM signals using one of a matched filed, a correlation filter, a digital filter. , Description:TECHNICAL FIELD The present disclosure relates to the field of communication. More specifically, but not exclusively, the present disclosure relates to transmitting and receiving Orthogonal Frequency Transition Modulation (OFTM) signals. BACKGROUND The field of communication is explored extensively for improving data rate and power requirements. Currently Orthogonal Frequency Division Modulation (OFDM) schemes are used in Long Term Evolution (LTE) / 4G. The OFDM schemes are also used for 5G New Radio (NR) by using millimetre wave technology to improve bandwidth efficiency and data rate. OFDM uses multiple sub-carriers (a band of frequencies is divided into many sub-carriers). The sub-carriers increase bandwidth efficiency and reduces multi-path fading. Also, more data can be transmitted as the sub-carriers are orthogonal to each other and guard bands can be eliminated. The sub-carriers are generated by shifting frequency of each consecutive sub-carrier by fundamental frequency. The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. SUMMARY In an embodiment, the present disclosure relates to a transmitter for transmitting Orthogonal Frequency Transition Modulation (OFTM) signals. The transmitter is configured to receive a plurality of bits for transmitting over a channel. The transmitter generates a plurality of waveforms for modulating the plurality of bits. Each waveform is a carrier signal configured to carry predefined input bits. Each waveform comprises a combination of at least one frequency selected from a group of combinations of plurality of frequencies. In an embodiment, the plurality of frequencies are orthogonal to each other. Each waveform is mapped to the corresponding predefined input bits and are transmitted over the channel. In an embodiment, the present disclosure discloses a receiver for receiving Orthogonal Frequency Transition Modulation (OFTM) signals. The receiver is configured to receive the plurality of waveforms transmitted over the channel. Further, the receiver is configured to determine the input bits by determining combination of frequencies used in the received OFTM signals. The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which: Figure 1 shows a block diagram of a typical communication system, in accordance with some embodiments of the present disclosure; Figure 2 shows an exemplary block diagram of a transmitter for transmitting OFTM signals, in accordance with some embodiments of the present disclosure; Figure 3 illustrates a time domain OFTM waveform, in accordance with some embodiments of the present disclosure; Figure 4 illustrates a spectrum of OFTM waveform, in accordance with some embodiments of the present disclosure; and Figure 5 shows a flow chart illustrating method steps for transmitting OFTM waveforms, in accordance with some embodiments of the present disclosure; Figure 6 shows an exemplary block diagram of a receiver for receiving OFTM signals, in accordance with some embodiments of the present disclosure; and Figure 7 shows an exemplary flow chart illustrating method steps for receiving OFTM waveforms, in accordance with some embodiments of the present disclosure. It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter. Similarly, it will be appreciated that any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and executed by a computer or processor, whether or not such computer or processor is explicitly shown. DETAILED DESCRIPTION In the present document, the word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or implementation of the present subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure. The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus. Embodiments of the present disclosure relate to a method a communication apparatus (transmitter and receiver) for communicating Orthogonal Frequency Transition Modulation (OFTM) signals/ waveforms. Input sequences/ codes/ bits (message signal) is modulated with a carrier waveform selected from a group comprising a plurality of carrier waveforms. Each waveform generated is a unique waveform having a at least one frequency from the plurality of orthogonal frequencies. Figure 1 shows a typical communication system. The communication system comprises a message source (101), a source encoder (102), a channel encoder (103), a modulator (104), a channel (105), a demodulator (106), channel decoder (107), source decoder (108) and destination (109). The message source (101) generates the message signal. The message source can be a user, microphone, a computing system, etc. Generally, the message signal like sound signals are continuous analog signal. In an embodiment, devices like microphones convert the sound signals to electrical signals. The electrical signals are converted to digital signal by the source encoder (102). The source encoder (102) can be a Analog to Digital Converted (A2D). The source encoder (102) samples the message signal, quantizes and encodes the message signals (into k bits). The output of the source encoder is a plurality binary symbols (M-ary symbols). The M-ary symbols are provided to the channel encoder (103). Shannon capacity represents the maximum rate (C) of transmitting the message in a given channel. The Shannon capacity formula is given by: C = Blog2(1 + S/N) Where B is the bandwidth of the channel; S is the signal power; N is the noise power; Channel encoder (103) is used to control errors in the channel. Typically block codes or convolutional codes are used in channel encoder (103). The channel encoder (103) essentially encodes information about the channel along with the message signal. The channel information is used by receivers for detecting the noise and decoding the message signal. In an embodiment, the modulator (104) modulates the message signal with carrier waveforms. Existing communication systems like Long Term Evolution (LTE) systems use OFDM carriers where a single frequency carrier or band of frequency is divided into a plurality of sub-carriers, all of which are modulated and transmitted simultaneously for a fundamental period. Reference is now made to Figure 2. Figure 2 shows a first configuration of a transmitter. The transmitter comprises an input interface (201), an OFTM waveform generator (202) and an output module (203). The input interface (201) receives the message signal. The message signal can be encoded symbols or the message bits. In an embodiment, the message signals may be in analog form or digital form. In an embodiment, the unique sub-carriers are generated by the Orthogonal Frequency Transition Modulation (OFTM) waveform generator (202). Each waveform generated is a unique waveform having a at least one frequency from the plurality of orthogonal frequencies. For example, each waveform can have 16 orthogonal frequencies. In an embodiment, the OFTM waveform generator (202) generates a plurality of OFTM waveforms. Each waveform is a combination from a plurality of combination of frequencies. Further, each waveform has a transition, either from one frequency to another frequency or transition between the same frequency. Essentially, each waveform comprises a at least one frequency from the plurality of orthogonal frequency. For example, let us consider 4 orthogonal frequencies represented as f0, f1, f2 and f3. The number of waveforms that can be generated using all possible combinations of the 4 frequencies is 44 = 256. Each waveform can transmit one symbol. Thus, waveforms generated using 4 orthogonal frequencies can transmit 256 symbols. Similarly, if 16 orthogonal frequencies are used, 1616 waveforms can be generated and thereby 1616 symbols can be transmitted. Figure 3 shows time-domain waveform and Figure 4 shows corresponding frequency-domain representation for specific OFTM waveform having following sequence of orthogonal frequencies [f0-f1-f2-f3-f4-f5-f6-f7-f8-f9-f10-f11-f12-f13-f14-f15]. In an exemplary embodiment, if f0 is considered as fundamental frequency, then f1 may be 2 times f0, f2 may be 3 times f0 and so on until f15 may be 16 times f0. Mathematically describing, let the sequence of these orthogonal frequencies be represented or labelled as f[n], where n is from 1 to N, and N=16 here. In an embodiment, f[n] represents the frequency for every cycle/ every half cycle in a waveform. In an embodiment f[1]=f0, f[2]=f1, etc. Let the corresponding waveform in continuous time-domain be represented or labelled as x(t). And let x(t=0) = 1. That is, at time t=0, the waveform has value of 1. This is just for convention or is arbitrary. In an embodiment, the waveform may be a cosine waveform or a sine waveform. A person skilled in the art will appreciate that x(0) = -1 (minus one) can be selected as well, and perform necessary sign or polarity change in what follows. The following illustrates how the waveform x(t) will appear during transmission. A specific value of ‘n’ is selected. This specific ‘n’, say n=1, will provide information about frequency f[n] when n=1, say f[1]. For the selected value of n, the range of time ‘t’ will be such that: ?_(i=1)^n¦1/(2f[i-1])