Create CONTRIBUTING.md

trekhleb · web-flow · commit 1456a54a66b3 · 2018-04-27T16:55:01.000+03:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+## Contributing
+
+As much as possible, try to follow the existing format of markdown and code.
+Don't forget to run `npm run lint` and `npm test` before submitting pull requests.
