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.
Contributors don't need to do anything other than pushing code. Maintainers should watch the issues for their subcomponents and see if it is updated or not. This will not be needed if we automate adding required labels to the PR after an update.