requirements for share roles

[Jian Zhang]

Hi Guys,

I not clear the requirements for source-roles on the Github.

Assume that I have a ansible project on the github, including multi roles and other files. 

Can I use it as a role via ansible-galaxy command directly?

If yes, how can I use the special role in the existed github?

If no, I must split these roles on the github, right?

BRs/Jian