add contribution guidelines

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+## Note on Patches/Pull Requests
+
+Thanks for taking the time to contribute back! To make it easier for us to
+review your changes, try to follow these guidelines:
+
+* Keep changesets small and on topic. Itching to refactor or clean something
+  up? Do it in a separate branch.
+* Stay consistent with existing code conventions.
+* Break changes into smaller logical commits.
+
+To propose a change:
+
+* [Fork the project.](https://help.github.com/articles/fork-a-repo)
+* Make your feature addition or bug fix.
+* Add tests for it. This is important so I don't break it in a future version unintentionally.
+* Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
+* [Send me a pull request](https://help.github.com/articles/using-pull-requests). Bonus points for topic branches.
+* [Check that your pull request passes the build](https://travis-ci.org/intridea/hashie/pull_requests).
+
+## Bug triage
+
+Have a problem? File an [issue here](https://github.com/intridea/hashie/issues).
+
+To make bug squashing easier, include the following in your issue:
+
+* What version of hashie are you using?
+* Is it still a problem in master?
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