Add docs about contributing, versioning etc

[shawaj]

Add proper info about how to contribute similar to other open source documentation repos.

[shawaj]

Contributing info page created but needs fleshing out e3fd2c9

[salmanfarisvp]

Add proper info about how to contribute similar to other open source documentation repos.

Do you have any open source contribute page model suggestions?

[salmanfarisvp]

This can be added as a code of conduct. https://www.contributor-covenant.org/version/1/4/code-of-conduct/