Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Contributing
+
+If you have discovered a bug or have a feature suggestion, feel free to create an issue on Github.
+
+If you'd like to make some changes yourself, see the following:
+1. [Fork](https://help.github.com/articles/fork-a-repo/) this repository to your own GitHub account and then [clone](https://help.github.com/articles/cloning-a-repository/) it to your local device
+2. Build and start the application: `yarn dev`
+3. Finally, submit a [pull request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/) with your changes!