Add CONTRIBUTING.md

srowen · srowen · commit 495c1ee2781e · 2018-11-22T15:59:06.000-06:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+## Contributing to spark-sklearn
+
+When you contribute code, you affirm that the contribution is your original work and that you 
+license the work to the project under the project's open source license. Whether or not you 
+state this explicitly, by submitting any copyrighted material via pull request, email, or 
+other means you agree to license the material under the project's open source license and 
+warrant that you have the legal authority to do so.
