Create CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+The maintainers of this project will treat everyone equally and fairly
+and expect anyone interacting with the project to do the same. Use common
+sense, that's about it.
+
+All interactions that are a net positive for the project are encouraged.
+Any negative actions or behaviour deemed innapropriate will be ignored
+or deleted.
+
+This code of conduct applies to this repository and related GitHub hosted
+services as well as emails addressed to the maintainers concerning this
+project.
+
+We've never had an issue with conduct or contributor behaviour, however
+it appears mandatory to now have a code of conduct and various services
+and sites won't stop bugging us about it.
+
+If anything really bad occurs the worst that will happen is we delete
+some comments or a few issues.