License, CoC, Readme
The project to be considered Open Source it must have a license!
There are 10 criterias that the license has to meet. Check online at opensource.org. You can find licenses on the site.
He likes the MIT license and uses this one.
###Code of Conduct
Not technically required but important. He never had to enforce it on anyone, but you can point people to it when they are not nice.
###Readme
We will talk about it later...