add CONTRIBUTING.md

Author: guschmue

CONTRIBUTING.md

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+# Contributing
+
+We're always looking for your help to fix bugs and improve the product. Create a pull request and we'll be happy to take a look.
+
+# Checkin procedure
+1. Fork the repo
+2. git clone your fork
+3. Create feature branch
+4. Make and checkin your changes along with unit tests
+5. git commit your changes
+6. git push origin HEAD
+7. To request merge into master send a pull request from the web ui
+https://github.com/onnx/tensorflow-onnx.
+
+
+New code *must* be accompanied by unit tests.
+
+*Note*: After creating a pull request, you will see a build getting triggered right away. You may check if style check and unit tests are passing.
+
+
+# Coding guidelines
+Please see [Coding Conventions and Standards](http://google.github.io/styleguide/pyguide.html)
+
+# Licensing guidelines
+This project welcomes contributions and suggestions. Most contributions require you to
+agree to a Contributor License Agreement (CLA) declaring that you have the right to,
+and actually do, grant us the rights to use your contribution. For details, visit
+https://cla-assistant.io/onnx/tensorflow-onnx.
+
+When you submit a pull request, a CLA-bot will automatically determine whether you need
+to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the
+instructions provided by the bot. You will only need to do this once across all repositories using our CLA.
+
+# Code of conduct
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/)
+or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.