Create CONTRIBUTING.md

CONTRIBUTING.md

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+We appreciate the time you are spending to contribute to this project! 🙌
+
+In order to have your pull request merged successfully, keep in mind the following key points:
+
+1. Every change you make, **it has to pass in unit tests**; if it's a new feature, new unit tests need to be added.
+2. Once the unit tests are running, we should continue aiming for `70%` and above.
+3. There is **NO NEED TO BUILD THE DIST FILES**. Just make sure you modify the `src` folder.
+4. Prettier and ESLint were set up to create standardized code, so it is important to follow their guidelines.
+5. **No disabling of ESLint rules is allowed**, unless there is a legit reason to do it.
+
+That's it! Thanks again for contributing to this awesome project! Hope to review your work soon 🙂