CLIAMS:1. A process for preparing a catalyst comprising the following steps: a) providing alumina support; b) coating zeolite gel over the alumina support to obtain a chloride free zeolite gel coated alumina support; c) crystallizing the chloride free zeolite gel coated alumina support to obtain a crystallized zeolite coated alumina support; d) washing, drying and calcining the crystallized chloride free zeolite coated alumina support to obtain a calcined crystallized chloride free zeolite coated alumina support; e) treating the calcined crystallized chloride free zeolite coated alumina support with ammonium nitrate to obtain sodium free support; and f) washing, drying, and calcining the support to obtain a calcined chloride free zeolite coated alumina support. g) immersing the calcined chloride free zeolite coated alumina support in an active metal and a promoter metal solution mixture followed by stirring to obtain a metal coated chloride free zeolite coated alumina support; and h) drying and calcining the metal coated chloride free zeolite coated alumina support to obtain the catalyst. 2. The process as claimed in claim 1, wherein said zeolite gel is prepared by, i. dissolving NaAlO2 in deionized water followed by stirring to form a first mixture; ii. adding tetraethyl ortho-silicate to said first mixture followed by stirring to form a second mixture; and iii. adding tetra-propylammonium hydroxide drop-wise to said second mixture followed by stirring to form said zeolite gel. 3. The process as claimed in claim 1, wherein said active metal and promoter metal solution mixture is prepared by, i) preparing an active metal solution by using at least one precursor of an active metal, wherein said active metal is a Group VIII metal; ii) preparing a promoter metal solution by using at least one precursor of a promoter metal, wherein said promoter metal is a Group IV metal; and iii) mixing the active metal solution and the promoter metal solution to form said active metal and promoter metal solution mixture. 4. The process as claimed in claim 1, wherein i. crystallization step (c) is carried out in a temperature range of 150oC to 250oC for a time period ranging from 2 days to 8 days under autogenous pressure; ii. drying step (d) is carried out in an oven in a temperature range of 100oC to 200oC; iii. calcination step(d) is carried out in a furnace in a temperature range of 500oC to 600oC for a time period ranging from 2 hours to 10 hours; iv. drying step (f) is carried out in an oven in a temperature range of 100oC to 200oC for a time period ranging from 10 hours to 20 hours; and v. calcination step (f) is carried out in a furnace in a temperature range of 500oC to 650oC for a time period ranging from 4 hours to 10 hours. 5. The process as claimed in claim 1, wherein said drying step (h) is carried out in an oven in a temperature range of 100oC to 200oC for a time period ranging from 10 hours to 20 hours. 6. The process as claimed in claim 1, wherein said calcining step (h) is carried out in a furnace in a temperature range of 500oC to 600oC for a time period ranging from 5 hours to 20 hours. 7. The process as claimed in claim 1, wherein said precursor of active metal is at least one selected from a group consisting of Diamine-dinitro platinate II, Hexachloroplatinic acid, Platinum acetylacetonate, Platinum Nitrate, Tetrammineplatinum (II) chloride, and Platinum (IV) chloride, preferably Hexachloroplatinic acid. 8. The process as claimed in claim 1, wherein said precursor of promoter metal is at least one selected from a group consisting of tetra butyl tin, tin (IV) chloride, and tin (II) chloride, preferably tin (II) chloride. 9. The process as claimed in claim 1, wherein said zeolite is at least one selected from the group consisting of ZSM-5, mordenite, USY, H-Beta, MCM-22, and ZSM-12. 10. The process as claimed in claim 1, wherein said zeolite is ZSM-5 comprising SiO2 and Al2O3. 11. The process as claimed in claim 1, wherein said zeolite is ZSM-5 having the ratio of SiO2 to Al2O3 ranging from 10:1 to 20:1, preferably 15:1. 12. A catalyst made by the process as claimed in claim 1. 13. A catalyst comprising a chloride free zeolite coated alumina support impregnated with 0.01 wt% to 0.5 wt% active metal and 0.01 wt% to 0.5 wt% promoter metal, wherein the thickness of said zeolite coating on said chloride free alumina support ranges from 100 µm to 200 µm. ,TagSPECI:FIELD OF THE DISCLOSURE The present disclosure relates to a process for preparing a catalyst. The present disclosure envisages a process for preparation of a catalyst to be used typically in reforming of naphtha during crude refining process. DEFINITIONS An active metal is a Group VIII metal of the modern periodic table. The Group VIII metals are platinum (Pt), palladium (Pd) and nickel (Ni). A promoter metal is a Group IV metal of the modern periodic table. The Group IV metals are tin (Sn), rhenium (Re) and iridium (Ir). ZSM-5 is an aluminosilicate zeolite belonging to the pentasil family of zeolites and its chemical formula is NanAlnSi96–nO192•16H2O (0