Create CONTRIBUTING.md (#35)

Author: BoRuDar

CONTRIBUTING.md

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+You can contribute to the project by opening issues or PRs.
+
+Flow to add a new feature or fix a bug:
+1. Fork this repository
+2. Create a branch from the `dev` branch
+3. Make sure you add unit tests which cover your changes
+4. Make sure you haven't introduced new linting errors
+5. Create a PR against `BoRuDar:dev` branch