Add contributing.md file

[Amulya-B28]

I would like to add this file because it is a crucial document in open-source repositories, providing clear guidelines and instructions for anyone interested in contributing to the project. It outlines how contributors can get involved, the contribution process, and the repository's coding standards and rules. Please assign this task to me.

[github-actions]

👋 Thank you for raising an issue! We appreciate your effort in helping us improve. Our team will review it shortly. Stay tuned!

[ombhojane]

It already exists, check in docs dir

you may look to enhance it

[Amulya-B28]

Okay, I will enhance the file.

[keys-i]

The above mentioned file doesn't exist
I say me and amulya work on it