Propose a Contributing COC

CONTRIBUTING.md

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+# Contributing 
+
+Please note we have a code of conduct, please follow it in all your interactions with the project. If you have any further questions please create an issue or ask in the Discord server.
+
+- Only fix/add the functionality in question OR address wide-spread whitespace/style issues, not both.
+- Address a single concern in the least number of changed lines as possible.
+
+**Do not make a pull request to merge into stable unless it is a hotfix. Use the development branch instead.**
+
+## 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 and wiki with details of changes to the interface, this includes new environment 
+   variables, exposed ports, useful file locations and container parameters.
+3. Write with detail on your pull request description what you have committed, to make it easier for the collaborators to make a changelog.