Initial commit 🎉

fbshipit-source-id: b6fc29740c6875d2e78953b8a7123890a67930f2
Co-authored-by: Sebastian McKenzie <sebmck@fb.com>
Co-authored-by: John Knox <jknox@fb.com>
Co-authored-by: Emil Sjölander <emilsj@fb.com>
Co-authored-by: Pritesh Nandgaonkar <prit91@fb.com>

CONTRIBUTING.md

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+# Contributing to Sonar
+
+We want to make contributing to this project as easy and transparent as
+possible.
+
+## Our Development Process
+
+Changes from Facebook employees are synced to the GitHub repo automatically.
+PRs from the community are imported into our internal source control and then
+pushed to GitHub.
+
+For changes affecting both, native code and JavaScript, make sure to only create
+a single PR containing both parts of the code.
+
+Although the Sonar desktop app is only released for macOS right now, it is
+possible to create Windows and Linux builds of the app. Please keep this in mind
+when dealing with platform-specific code.
+
+## 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
+
+We are using Prettier to format our source code. The styles are enforced via
+eslint. Make sure everything is well formatted before creating a PR. Therefore,
+run `yarn lint` and `yarn fix` to apply formatting fixes.
+
+## License
+
+By contributing to Sonar, you agree that your contributions will be licensed
+under the LICENSE file in the root directory of this source tree.