Create CONTRIBUTING.md

CONTRIBUTING.md

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+# About
+This file documents the contribution guidelines for this project. This list is by no means complete and the final decision to accept contribution in form of PRs is reserved by the owner of this project.
+
+# Code quality
+- This project uses Prettier to take care of some of the code styling hassles. Ensure that the commited code is pre-formatted per the included Prettier configuration file.
+- All tests must pass before the code is pushed.
+    - Fix any tests which are broken by the new changes.
+    - Add new tests along with your changes before submitting PRs.