doc: move CoC reporting guidelines from wiki

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

doc/doxygen/src/coc-reporting-guide.md

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+# Reporting Guidelines   {#coc-reporting-guide}
+
+If you believe someone is violating the [code of conduct][CoC] we ask that you
+report it to us by emailing <conduct@riot-os.org>. Currently, the recipients of
+this email address are [@OlegHahm](https://github.com/OlegHahm) (Oleg Hahm) and
+[@miri64](https://github.com/miri64) (Martine Lenders).
+
+**All reports will be kept confidential.** In some cases we may determine that a
+public statement will need to be made. If that's the case, the identities of all
+victims and reporters will remain confidential unless those individuals instruct
+us otherwise.
+
+**If you believe anyone is in physical danger, please notify appropriate law
+enforcement first.** If you are unsure what law enforcement agency is
+appropriate, please include this in your report and we will attempt to notify
+them.
+
+If you are unsure whether the incident is a violation, or whether the space
+where it happened is covered by this Code of Conduct, we encourage you to still
+report it. We would much rather have a few extra reports where we decide to take
+no action, rather than miss a report of an actual violation. We do not look
+negatively on you if we find the incident is not a violation. And knowing about
+incidents that are not violations, or happen outside our spaces, can also help
+us to improve the Code of Conduct or the processes surrounding it.
+
+In your report please include:
+
+-   Your contact info (so we can get in touch with you if we need to follow up)
+-   Names (real, nicknames, or pseudonyms) of any individuals involved. If there
+    were other witnesses besides you, please try to include them as well.
+-   When and where the incident occurred. Please be as specific as possible.
+-   Your account of what occurred. If there is a publicly available record (e.g.
+    forum post, a mailing list archive, or a public Matrix chat link) please include a link.
+-   Any extra context you believe existed for the incident.
+-   If you believe this incident is ongoing.
+-   Any other information you believe we should have.
+
+### What happens after you file a report?
+
+You will receive an email from one of the core community members as soon as
+possible. We promise to acknowledge receipt within 24 hours (and will aim for
+much quicker than that).
+
+They will review the incident and determine:
+
+-   What happened.
+-   Whether this event constitutes a code of conduct violation.
+-   Who the bad actor was.
+-   Whether this is an ongoing situation, or if there is a threat to anyone's
+    physical safety.
+
+If this is determined to be an ongoing incident or a threat to physical safety,
+their immediate priority will be to protect everyone involved.
+This means we may delay an "official" response until we believe that the
+situation has ended and that everyone is physically safe.
+
+Once the working group has a complete account of the events they will make a
+decision as to how to response. Responses may include:
+
+-   Nothing (if we determine no violation occurred).
+-   A private reprimand from us to the individual(s) involved.
+-   A public reprimand.
+-   An imposed vacation (i.e. asking someone to "take a week off" from the forum, the Matrix chats, or a mailing
+    list).
+-   A permanent or temporary ban from some or all RIOT spaces (forum, Matrix chats, mailing lists,
+    etc.)
+-   A request for a public or private apology.
+
+We'll respond within one week to the person who filed the report with either a
+resolution or an explanation of why the situation is not yet resolved.
+
+Once we've determined our final action, we'll contact the original reporter to
+let them know what action (if any) we'll be taking. We'll take into account
+feedback from the reporter on the appropriateness of our response, but we don't
+guarantee we'll act on it.
+
+#### Reference
+These reporting guidelines were adapted from the [Django reporting guidelines](https://www.djangoproject.com/conduct/reporting/)
+
+[CoC]: https://github.com/RIOT-OS/RIOT/blob/master/CODE_OF_CONDUCT.md