Add notes on how you can help to contributing documentation

Author: joshsmith

CONTRIBUTING.md

@@ -1,4 +1,18 @@
-# Issue Labeling
+## How can I help?
+
+The first place to start is by looking at our [GitHub Issues](https://github.com/rails-api/active_model_serializers/issues).
+
+The vast majority of development is happening under the `master` branch, currently slated for release as `0.10.x`. This is where we would suggest you start.
+
+Fixing bugs is extraordinarily helpful and requires the least familiarity with AMS. Look for issues labeled [**Needs Bug Verification**](https://github.com/rails-api/active_model_serializers/labels/Needs%20Bug%20Verification) and [**Bug**](https://github.com/rails-api/active_model_serializers/labels/bug).
+
+We are also actively working to identify tasks under the label [**Good for New Contributors**](https://github.com/rails-api/active_model_serializers/labels/Good%20for%20New%20Contributors). Some bugs are expressly not good for new contributors, so don't expect 100% overlap between the two.
+
+If you want to work on new feature development, look for the label [**Feature**](https://github.com/rails-api/active_model_serializers/labels/Feature).
+
+We are also encouraging comments to substantial changes (larger than bugfixes and simple features) under an "RFC" (Request for Comments) process before we start active development. Look for the [**RFC**](https://github.com/rails-api/active_model_serializers/labels/RFC) label.
+
+## Issue Labeling
 
 AMS uses a subset of [StandardIssueLabels](https://github.com/wagenet/StandardIssueLabels) for Github Issues. You can [see our labels here](https://github.com/rails-api/active_model_serializers/labels).
 
@@ -8,4 +22,4 @@ AMS uses a subset of [StandardIssueLabels](https://github.com/wagenet/StandardIs
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
-5. Create a new Pull Request
+5. Create a new Pull Request