Add Contributing.md

[jamesqquick]

"As a potential contributor, I'd like documentation that would allow me to more easily to contribute to the project"

[HemaDevikaPutta]

Hi James qquick

For this issues, I prepared a documentation and i try to push my code in new branch getting access denied. Kindly give access to my merge request.

[jamesqquick]

Hi! I don't giving direct access to you would make sense in this case. Instead, you can submit a PR which will allow me to approve before mergin.