* provider/github: add GitHub labels resource
Provides a GitHub issue label resource.
This resource allows easy management of issue labels for an
organisation's repositories. A name, and a color can be set.
These attributes can be updated without creating a new resource.
* provider/github: add documentation for GitHub issue labels resource
GitHub really doesn't like when you make the H lowercase, it violates
their brand guidelines and they won't help promote anything that doesn't
use the capital H.
Ian L