Suggestion: Add contributing guidelines

[OmkarPh]

Is your feature request related to a problem? Please describe. 💡
Any new contributor has to figure about project structure and has to spent quite some time figuring it out. It would be very helpful if there is a contributing guidelines for their help.
I am also new to this repo. Admins may look after it.

Describe the solution you'd like ✨
Add CONTRIBUTING.md file with steps
Add .env.sample file providing default environment variables (May I do this part?)

[fave77]

@OmkarPh The contributing guidelines already exist. For your reference, please check CONTRIBUTING.md

[OmkarPh]

Oops !
My bad ;)