add documentation for setting up eslint and making the code prettier

[subhangi2731]

I will write all the steps as how the eslint is setup and how the code is made prettier and which files are modified and enhanced

[subhangi2731]

@khannakshat7 please assign me this issue

[khannakshat7]

@subhangi2731 Any update?

[subhangi2731]

@khannakshat7 i am working on this will make a pr by tomorrow