Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+When contributing to this repository, please **first discuss the change you wish to make via issue,
+email, or any other method with the owners of this repository**. 
+
+Pull requests that do not respond to an open issue that has been agreed upon by the maintainers 
+will most likely be rejected. 
+
+Please note we have a code of conduct, please follow it in all your interactions with the project. 
+
+## Pull Request Process
+
+1. Ensure any install or build dependencies are removed before the end of the layer when doing a 
+   build. 
+2. Update the README.md with details of changes to the interface, this includes new environment 
+   variables, exposed ports, useful file locations and container parameters.