(GH-566) Add Code of Conduct

Author: ghoneycutt

CODE_OF_CONDUCT.md

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+# Open Source Code of Conduct
+
+In order to foster an inclusive, kind, harassment-free and cooperative
+community, Sensu enforces this code of conduct on our software projects
+and events.
+
+## Summary
+
+Harassment in code and discussion or violation of physical boundaries is
+completely unacceptable anywhere in Sensu’s project codebases, issue
+trackers, chatrooms, forums, mailing lists, meetups and other events.
+Violators will be warned by the core team. Repeat violations will result
+in being blocked or banned by the core team at or before the third
+violation.
+
+## In detail
+
+Harassment includes offensive verbal comments related to gender
+identity, gender expression, sexual orientation, disability, physical
+appearance, body size, race, religion, sexual images, deliberate
+intimidation, stalking, sustained disruption and unwelcome sexual
+attention.
+
+Individuals asked to stop any harassing behavior are expected to comply
+immediately.
+
+Maintainers are also subject to the anti-harassment policy.
+
+If anyone engages in harassing behavior, including maintainers, we may
+take appropriate action, up to and including warning the offender,
+deletion of comments, removal from the project’s codebase and
+communication systems and escalation to GitHub support.
+
+If you are being harassed, notice that someone else is being harassed,
+or have any other concerns, please contact a member of the core team or
+email [[email protected]](mailto:[email protected]) immediately.
+
+We expect everyone to follow these rules anywhere in Sensu’s project
+codebases, issue trackers, chatrooms, forums and mailing lists.
+
+Finally, don’t forget that it is human to make mistakes! We all do.
+Let’s work together to help each other, resolve issues and learn from
+the mistakes that we will all inevitably make from time to time.
+
+## Thanks
+
+Thanks to thoughtbot, CocoaPods, Bundler, JSConf and Contributor
+Covenant for inspiration and ideas.
+
+## License
+
+To the extent possible under law, Sensu Inc has waived all copyright and
+related or neighboring rights to the Sensu Code of Conduct. This work is
+published from the United States.
+
+![public_domain](https://licensebuttons.net/p/zero/1.0/88x31.png)