add code of conduct to project

README.md

@@ -69,7 +69,9 @@ Before contributing to Discourse:
 1. Please read the complete mission statements on [**discourse.org**](http://www.discourse.org). Yes we actually believe this stuff; you should too.
 2. Read and sign the [**Electronic Discourse Forums Contribution License Agreement**](http://discourse.org/cla).
 3. Dig into [**CONTRIBUTING.MD**](CONTRIBUTING.md), which covers submitting bugs, requesting new features, preparing your code for a pull request, etc.
-4. Not sure what to work on? [**We've got some ideas.**](http://meta.discourse.org/t/so-you-want-to-help-out-with-discourse/3823)
+4. Always strive to collaborate [with mutual respect](https://github.com/discourse/discourse/blob/master/docs/code-of-conduct.md).
+5. Not sure what to work on? [**We've got some ideas.**](http://meta.discourse.org/t/so-you-want-to-help-out-with-discourse/3823)
+
 
 We look forward to seeing your pull requests!
 

docs/code-of-conduct.md

@@ -0,0 +1,50 @@
+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, and in the interest of
+fostering an open and welcoming community, we pledge to respect all people who
+contribute through reporting issues, posting feature requests, updating
+documentation, submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project a harassment-free
+experience for everyone, regardless of level of experience, gender, gender
+identity and expression, sexual orientation, disability, personal appearance,
+body size, race, ethnicity, age, religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information, such as physical or electronic
+  addresses, without explicit permission
+* Other unethical or unprofessional conduct
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+By adopting this Code of Conduct, project maintainers commit themselves to
+fairly and consistently applying these principles to every aspect of managing
+this project. Project maintainers who do not follow or enforce the Code of
+Conduct may be permanently removed from the project team.
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting a project maintainer at team@discourse.org. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. Maintainers are
+obligated to maintain confidentiality with regard to the reporter of an
+incident.
+
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 1.3.0, available at
+[http://contributor-covenant.org/version/1/3/0/][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/3/0/