Internal update.

PiperOrigin-RevId: 176729983

Author: craigcitro

CONTRIBUTING.md

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+# How to Contribute
+
+See the README.

README.md

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+# Google Colaboratory
+
+[Colaboratory](https://colab.research.google.com) is a research project created
+to help disseminate machine learning education and research. It’s a Jupyter
+notebook environment that requires no setup to use. For more information, see
+our [FAQ](https://research.google.com/colaboratory/faq.html).
+
+This repository contains the code for the Python libraries available in the
+Colab.
+
+## Contacting Us
+
+For support or help using Colab, please submit questions tagged with
+`google-colaboratory`
+on
+[StackOverflow](https://stackoverflow.com/questions/tagged/google-colaboratory).
+
+For any product issues, you can
+either [submit an issue](https://github.com/googlecolab/colabtools/issues) or
+"Help" -> "Send Feedback" in Colab.
+
+## Contributing
+
+If you have a problem, or see something that could be improved, please file an
+issue. However, we don't have the bandwidth to support review of external
+contributions, and we don't want user PRs to languish, so we aren't accepting
+any external contributions right now.