📚 Add CONTIBUTING.md

Author: heppokofrontend

CONTRIBUTING.md

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+# Contributing
+
+1. Fork it!
+2. Create your feature branch: `git switch -c my-new-feature`
+3. Commit your changes: `git commit -am 'Add some feature'`
+4. Push to the branch: `git push origin my-new-feature`
+5. Submit a pull request :D