Add contributing file.

CONTRIBUTING.md

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+# Contributing
+
+We welcome any contributions or feature requests you would like to submit!
+
+Fork the Project
+* Create your Feature Branch (git checkout -b feature/AmazingFeature)
+* Commit your Changes (git commit -m 'Add some AmazingFeature')
+* Push to the Branch (git push origin feature/AmazingFeature)
+* Open a Pull Request
+
+When implementing your new feature, please follow Fabric [core design principles](./MANIFESTO.md#core-design-principles).