Add CONTRIBUTING file to top of tree

Summary: To keep consistency between different projects.

Reviewed By: tox-fb

Differential Revision: D12875062

fbshipit-source-id: ee3c5fc7e0460aea71ebcd89894669b6479d270a

CONTRIBUTING.md

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+# Contributing to Surround 360
+
+We want to make contributing to this project as easy and transparent as
+possible.
+
+## Code of Conduct
+The code of conduct is described in [`CODE_OF_CONDUCT.md`](CODE_OF_CONDUCT.md).
+
+## Our Development Process
+
+We maintain a repository for Surround 360 using Facebook's internal infrastructure, which is automatically synched with GitHub.
+
+## Pull Requests
+
+We actively welcome your pull requests.
+
+1. Fork the repo and create your branch from `master`.
+2. If you've added code that should be tested, add tests.
+3. If you've changed APIs, update the documentation.
+4. Ensure the test suite passes.
+5. Make sure your code lints.
+6. If you haven't already, complete the Contributor License Agreement ("CLA").
+
+## Contributor License Agreement ("CLA")
+
+In order to accept your pull request, we need you to submit a CLA. You only need
+to do this once to work on any of Facebook's open source projects.
+
+Complete your CLA here: <https://code.facebook.com/cla>
+
+## Issues
+
+We use GitHub issues to track public bugs. Please ensure your description is
+clear and has sufficient instructions to be able to reproduce the issue.
+
+Facebook has a [bounty program](https://www.facebook.com/whitehat/) for the safe
+disclosure of security bugs. In those cases, please go through the process
+outlined on that page and do not file a public issue.
+
+## Coding Style and License
+
+See the CONTRIBUTING file in each subdirectory for more information.