docs: move contributing info into CONTRIBUTING.MD

CONTRIBUTING.md

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+## Code conventions
+
+The project follows idiomatic [Go conventions] for style.
+
+[Go conventions]: https://github.com/jzelinskie/conventions
+
+## Communication
+
+Currently, real time conversation happens on [#chihaya] on [freenode].
+We are currently attempting to have more information available on GitHub.
+
+[#chihaya]: http://webchat.freenode.net?channels=chihaya
+[freenode]: http://freenode.net
+
+## Pull request procedure
+
+Please don't write massive patches without prior communication, as it will most
+likely lead to confusion and time wasted for everyone. However, small
+unannounced fixes are always welcome!
+
+Pull requests should be targeted at the `master` branch. Before pushing to your
+Github repo and issuing the pull request, please do two things:
+
+1. [Rebase](http://git-scm.com/book/en/Git-Branching-Rebasing) your
+   local changes against the `master` branch. Resolve any conflicts
+   that arise.
+
+2. Run the test suite with the `godep go test -v ./...` command.
+
+Pull requests will be treated as "review requests", and we will give
+feedback we expect to see corrected on [style] and substance before pulling.
+Changes contributed via pull request should focus on a single issue at a time,
+like any other. We will not accept pull-requests that try to "sneak" unrelated
+changes in.
+
+Any new files should include the license header found at the top of every
+source file.
+
+[style]: https://github.com/jzelinskie/conventions