<NME> CONTRIBUTING.md
<BEF> CLAHub itself has no CLA (yet?).

To contribute, just issue a pull request.  Include tests, please.

<MSG> Ta-da...! update CONTRIBUTING.md to reflect CLA

<DFF> @@ -1,3 +1,8 @@
-CLAHub itself has no CLA (yet?).
+Thanks for contributing to CLAHub!  To get started:
 
-To contribute, just issue a pull request.  Include tests, please.
+1. Sign the CLA at <http://www.clahub.com/agreements/clahub/clahub>.
+2. Fork the repo, do work in a feature branch.  Please include acceptance tests.
+3. Make sure the automated test suite succeeds with `rake`.
+4. Issue a pull request.
+
+If you have any questions, open an issue or email [jason.p.morrison@gmail.com](mailto:jason.p.morrison@gmail.com).

Ta-da...! update CONTRIBUTING.md to reflect CLA