It should be enough to begin with 
There’s been some discussion about this somehow here: Auth: what about signing up?
You are on good tracks, I’m only referring to this so you can see a bit of what the community discussed on the matter - there are other threads with relevant information as well.
Also, adding a new provider is a very good exercise to figure out how the auth works, figured it first hand :). If you want to give a try I’m willing to assist.