docs: Add code of conduct.

README.md

@@ -46,6 +46,8 @@ Anybody with a GitHub account should be able to create Issues there
 pertaining to bugs or enhancement requests.  We also use Pull
 Requests as our primary mechanism to receive code contributions.
 
+The Zulip community has a [Code of Conduct][code-of-conduct].
+
 ## Installing the Zulip Development environment
 
 The Zulip development environment is the recommended option for folks
@@ -108,6 +110,7 @@ and [Trello][]), plus [node.js API bindings][node], an [isomorphic
 contributing!
 
 [cla]: https://opensource.dropbox.com/cla/
+[code-of-conduct]: https://zulip.readthedocs.io/en/latest/code-of-conduct.html
 [dev-install]: https://zulip.readthedocs.io/en/latest/dev-overview.html
 [doc]: https://zulip.readthedocs.io/
 [doc-commit-style]: http://zulip.readthedocs.io/en/latest/version-control.html#commit-messages

docs/code-of-conduct.md

@@ -0,0 +1,97 @@
+# Zulip Code of Conduct
+
+## Our Commitment
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers are committed to making participation in our
+project and our community a harassment-free experience for everyone, regardless
+of age, body size, disability, ethnicity, gender identity and expression, level
+of experience, nationality, personal appearance, race, religion, or sexual
+identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being friendly and patient
+* Being respectful of differing viewpoints and experiences, and trying to
+  understand other people's points of view
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+* Assuming other community members have good intentions, and treating
+  them with respect and patience accordingly.
+* Respecting the time and attention of others, in particular:
+  * Including tracebacks, any changes you've made, and other relevant
+    details in bug/error reports.
+  * Asking broadly relevant questions in public forums, rather than
+  sending private messages to individuals, so that the first available
+  expert can answer, and the answers are available to the whole
+  community.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Criticism of contributions which is not constructive, which occurs outside
+  project channels or which is repetitive
+* Publishing others' private information, such as a physical or electronic
+  address without explicit permission
+
+We will exclude you from interaction if you insult, demean or harass anyone.
+That is not welcome behavior.
+
+## Responsibilities of Project Maintainers
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+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.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+project spaces include mailing lists, chat.zulip.org, GitHub and in code.
+Examples of representing a project or community include using an official
+project e-mail address, posting via an official social media account, or acting
+as an appointed representative at an online or offline event.
+
+## Enforcement
+
+To report code of conduct violations or concerns, please contact
+zulip-code-of-conduct@googlegroups.com immediately.  Whether you're a
+regular contributor or a newcomer, we care about making this community
+a safer place for you and we've got your back.
+
+We encourage anyone who observes abusive, harassing, or otherwise
+unacceptable behavior to report that by emailing
+zulip-code-of-conduct@googlegroups.com. All reports will be reviewed
+and investigated and will result in a response that is deemed
+necessary and appropriate to the circumstances by the project
+maintainers.  The project team will keep confidential the details of
+the reporter when possible.
+
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][cchomepage]
+[version 1.4][ccversion] and the [Rust Code of Conduct][rsconduct].
+
+[cchomepage]: http://contributor-covenant.org
+[ccversion]: http://contributor-covenant.org/version/1/4/
+[rsconduct]: https://www.rust-lang.org/en-US/conduct.html