GitHub Issues Workflow for Chef

This RFC codifies the workflow of Chef maintainers while maintaining issues and contributions for Chef.

Special thanks to @btm / @lamont-granquist / @danielsdeleo / @mcquin / @adamedx / @jdmundrawala  who has helped put the first version come together.
There's a lot of wordiness here. I would just say:

> This RFC codifies the workflow Chef uses to track bug reports and contributions using [GitHub issues](...).