add license

CONTRIBUTING.md

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+# Contributing guidelines
+
+[Contributor License Agreement]: https://git.k8s.io/community/CLA.md
+[github workflow guide]: https://github.com/kubernetes/community/blob/master/contributors/guide/github-workflow.md
+[CNCF code of conduct]: https://github.com/cncf/foundation/blob/master/code-of-conduct.md
+
+## Contributing A Patch
+
+1. Kubernetes projects require contributors to sign the
+   [Contributor License Agreement] before pull requests
+   can be considered.
+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.
+   See the [github workflow guide] for more information.
+1. For new features, provide a markdown based demo following
+   the pattern established in the `demos` directory.
+   Run `bin/pre-commit.sh` to test your demo.
+1. Submit a pull request.
+
+
+## Community, discussion, contribution, and support
+
+Learn how to engage with the Kubernetes community on
+the [community page](http://kubernetes.io/community/).
+
+You can reach the maintainers of this project at:
+
+- [Slack](http://slack.k8s.io/)
+- [Mailing List](https://groups.google.com/forum/#!forum/kubernetes-kustomize)
+
+## Code of conduct
+
+Participation in the Kubernetes community is governed
+by the [CNCF code of conduct].