Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing guidelines
+
+## Sign the CLA
+
+Kubernetes projects require that you sign a Contributor License Agreement (CLA) before we can accept your pull requests.  Please see https://git.k8s.io/community/CLA.md for more info
+
+### Contributing A Patch
+
+1. Submit an issue describing your proposed change to the repo in question.
+1. The [repo owners](OWNERS) will respond to your issue promptly.
+1. If your proposed change is accepted, and you haven't already done so, sign a Contributor License Agreement (see details above).
+1. Fork the desired repo, develop and test your code changes.
+1. Submit a pull request.
+