HabitRPG Docs Project

Initial commit that explains a little about the HabitRPG Docs Project and how to get involved. 

Was going to have folks submit pull requests to my fork, but submitting to this branch seems cleaner and less confusing.  

@lefnire If you can merge this one, I will treat that as "sign off" to commit future pull requests to this branch myself. Figuring this out as I go.