Improved contribution and setup docs

[fbuys]

As a new contributor it would be nice to have a contributing doc for reference.
This same doc can also guide developers in setting the project up locally.

I am opening this issue so we can perhaps start the conversation around what we would like to include in such a document should we decide to go ahead and add a contributing doc.

[fbuys]

Hey, I just want to add that I can work on this if this is something the maintainers would like to add to the project.