doc: move CoC FAQ from wiki

See also https://github.com/RIOT-OS/RIOT/wiki/CoC:-FAQ/_history

doc/doxygen/src/coc-faq.md

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+# FAQ  {#coc-faq}
+
+This FAQ attempts to address common questions and concerns around the RIOT
+community's future [Code of Conduct][CoC]. If you still have questions after
+reading it, please feel free to [contact us][CoC-question-mail].
+
+--------------------------------------------------------------------------------
+
+### Why have you adopted a Code of Conduct?
+
+If you're familiar with the RIOT
+community, you'll probably notice that the Code basically matches what we
+already do. Think of this as documentation: we're taking implicit expectations
+about behavior and making them explicit.
+
+We're doing this because the RIOT community is growing faster than any of us
+could have anticipated. This is on balance a very positive thing, but as we've
+grown past the point where it's possible to know the whole community we think
+it's very important to be clear about our values.
+
+We know that the RIOT community is open, friendly, and welcoming. We want to
+make sure everyone else knows it too.
+
+### What does it mean to "adopt" a Code of Conduct?
+
+For the most part, we don't think it means large changes. We think that the text
+does a really good job describing the way the RIOT community already conducts
+itself. We expect that most people will simply continue to behave in the awesome
+way they have for years.
+
+However, we do expect that people will abide by the spirit and words of the CoC
+when in "official" RIOT spaces. This code has been adopted by the RIOT community
+as a whole. That means that it'll apply in all community spaces.
+
+In practice, this means the [RIOT forum](https://forum.riot-os.org), the Matrix chats (e.g., [`#riot-os`](https://matrix.to/#/#riot-os:matrix.org) or [`#riot-os-off-topic`](https://matrix.to/#/#riot-os-off-topic:matrix.org)), mailing lists (e.g., security@riot-os.org), bug tracking and code review tools, and
+"official" RIOT events such as Hack'n'ACKs or RIOT summits. In addition,
+violations of this code outside these spaces may affect a person's ability to
+participate within them.
+
+### What happens if someone violates the Code of Conduct?
+
+Our intent is that anyone in the community can stand up for this code, and
+direct people who're unaware to this document. If that doesn't work, or if you
+need more help, you can contact <conduct@riot-os.org>. For more details please see
+our [[Reporting Guidelines|CoC: Reporting Guidelines]].
+
+### Why do we need a Code of Conduct? Everyone knows not to be a jerk.
+
+Sadly, not everyone knows this.
+
+However, even if everyone was kind, everyone was compassionate, and everyone was
+familiar with codes of conduct it would still be incumbent upon our community to
+publish our own. Maintaining a code of conduct forces us to consider and
+articulate what kind of community we want to be, and serves as a constant
+reminder to put our best foot forward. But most importantly, it serves as a
+signpost to people looking to join our community that we feel these values are
+important.
+
+### This is censorship! I have the right to say whatever I want!
+
+You do -- in *your* space. If you'd like to hang out in *our* spaces (as
+clarified above), we have some simple guidelines to follow. If you want to, for
+example, form a group where RIOT is discussed using language inappropriate for
+general channels then nobody's stopping you. We respect your right to establish
+whatever codes of conduct you want in the spaces that belong to you. Please
+honor this Code of Conduct in our spaces.
+
+#### References
+This FAQ was adapted from the [Django Code of Conduct FAQ](https://www.djangoproject.com/conduct/faq/)
+
+[CoC-question-mail]: mailto:riot@riot-os.org
+[CoC]: https://github.com/RIOT-OS/RIOT/blob/master/CODE_OF_CONDUCT.md