Add code of conduct.

.github/CODE_OF_CONDUCT.md

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+# Rocket Community Code of Conduct
+
+Like the technical community as a whole, the Rocket project, its teams, and its
+community are made up of a mixture of professionals and volunteers from all over
+the world, working on every aspect of the mission. Diversity is one of our huge
+strengths, but it can also lead to communication issues and unhappiness. To that
+end, we have a few ground rules that we ask people to adhere to. This code
+applies equally to everyone in our community: maintainers, contributors, team
+leads, mentors, those seeking help and guidance, and so on.
+
+This isn’t an exhaustive list of things that you can’t do. Rather, take it in
+the spirit in which it’s intended - a guide to make it easier to enrich all of
+us and the technical communities in which we participate.
+
+_If you believe someone is violating the code of conduct, we ask that you report
+it by emailing community@rwf2.org._
+
+- **Be friendly. Be Kind. Be patient.**
+
+- **Be welcoming.** We strive to be a community that welcomes and supports
+  everyone, of all backgrounds and identities. This includes, but is not limited
+  to members of any race, ethnicity, culture, national origin, color,
+  immigration status, social and economic class, educational level, sex, sexual
+  orientation, gender identity and expression, age, size, family status,
+  political belief, religion, and mental and physical ability.
+
+- **Be considerate.** Your work will be used by other people, and you in turn
+  will depend on the work of others. Any decision you take will affect users and
+  colleagues, and you should take those consequences into account when making
+  decisions. Remember that we're a global community, so you might not be
+  communicating in someone else's primary language.
+
+- **Be respectful.** We won't all agree all the time, but disagreement isn't an
+  excuse for poor behavior or poor manners. While frustrations may occasionally
+  arise, we cannot allow those frustrations to turn into personal attacks.
+  Remember that a community where people feel uncomfortable or threatened is not
+  a productive one. Be respectful, not just to fellow community members, but to
+  individuals outside the community as well.
+
+- **Be careful in the words that you choose.** We are a community of
+  professionals, and we conduct ourselves professionally. Do not insult or put
+  down other participants. Harassment and other exclusionary behavior aren't
+  acceptable. This includes, but is not limited to:
+  - Violent threats or language directed against another person.
+  - Discriminatory jokes and language.
+  - Posting sexually explicit or violent material.
+  - Posting (or threatening to post) other people's personally identifying
+    information ("doxing").
+  - Personal insults, especially those using racist or sexist terms.
+  - Unwelcome sexual attention.
+  - Advocating for, or encouraging, any of the above behavior.
+  - Repeated harassment of others. In general, if someone asks you to stop, then
+    stop.
+
+- **Be understanding.** Disagreements, both social and technical, happen all the
+  time. It is important that we resolve differing views constructively. When we
+  disagree, try to understand why. Our community consists of people from a wide
+  range of backgrounds. Different people have different perspectives on issues.
+  Being unable to understand why someone holds a viewpoint doesn’t mean that
+  they’re wrong. Don’t forget that it is human to err; blame accomplishes
+  nothing. Instead, focus on helping to resolve issues and learning from
+  mistakes.
+
+_This code of conduct applies to all spaces managed by Rocket or the Rocket Web
+Framework Foundation including issues and discussions on GitHub, Matrix, and any
+other forums which the community uses for communication._
+
+_This Code of Conduct is adapted from the [Django Code of Conduct]. Original text
+from the [Speak Up! project]._
+
+[Django Code of Conduct]: https://www.djangoproject.com/conduct/
+[Speak Up! project]: http://web.archive.org/web/20141109123859/http://speakup.io/coc.html