contributing guideline

CONTRIBUTING.md

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+twitter-bootstrap-rails is a volunteer effort. We encourage you to pitch in.
+
+__*We only accept bug reports and pull requests in GitHub*__. Join the team!
+
+* If you have a support question about how to use twitter-bootstrap-rails, please [ask on StackOverflow](http://stackoverflow.com/search?tab=newest&q=twitter-bootstrap-rails).
+
+* Bug reports should include the following:
+  - Minimal example of code to reproduce the bug
+  - Stacktrace
+  - What you expected to see, and what you actually saw.
+
+* Feature requests should be accompanied by a patch, that includes tests.
+* We won't accept any feature requests that come without a patch.
+
+Thanks for the your contributions!