Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Llama 3
+We want to make contributing to this project as easy and transparent as
+possible.
+
+## Our Development Process
+... (in particular how this is synced with internal changes to the project)
+
+## Pull Requests
+We actively welcome your pull requests.
+
+1. Fork the repo and create your branch from `main`.
+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 Meta'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.
+
+Meta has a [bounty program](https://bugbounty.meta.com/) 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  
+* 2 spaces for indentation rather than tabs
+* 80 character line length
+* ...
+
+## License
+By contributing to Llama 3, you agree that your contributions will be licensed
+under the LICENSE file in the root directory of this source tree.