Some updates for the contributing file.

Author: Sam Phippen

CONTRIBUTING.md

@@ -23,3 +23,28 @@ If you'd like to help make RSpec better, here are some ways you can contribute:
 If you need help getting started, check out the [DEVELOPMENT](DEVELOPMENT.md) file for steps that will get you up and running.
 
 Thanks for helping us make RSpec better!
+
+## `Small` issues
+
+Small issues are the ones that we be believe are best suited for new
+contributors to get started on. They represent a meaningful contribution to the
+project that can be made that should not be too hard to pull off.
+
+## `Triage` issues
+
+Triage issues are ones that have been labelled by the maintainers that we
+believe do not currently have enough information for them to be reproduced by
+us. You can help us move triage issues into `ready to go` or `has reproduction
+case` (for feature requests or bugs) as a seriously meaningful contribution.
+
+## `Has reproduction case` issues
+
+Issues that have reproduction cases have a repository that we can clone that
+enable us to quickly determine the issue is valid and then start debugging
+within RSpec. These issues are good ones to tackle to help us actively fix bugs.
+
+## Maintenance branches
+
+Maintenance branches are how we manage the different supported point releases
+of RSpec. As such, while they might look like good candidates to merge into
+master, please do not open pull requests to merge them.