Create CONTRIBUTING.md (#2)

CONTRIBUTING.md

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+# Kubeflow Contributor Guide
+
+Welcome to the Kubeflow project! We'd love to accept your patches and 
+contributions to this project. Please read the 
+[contributor's guide in our docs](https://www.kubeflow.org/docs/about/contributing/).
+
+The contributor's guide
+
+* shows you where to find the Contributor License Agreement (CLA) that you need 
+  to sign,
+* helps you get started with your first contribution to Kubeflow,
+* and describes the pull request and review workflow in detail, including the
+  OWNERS files and automated workflow tool.