chore: Add code of conduct

The recent events highlighted once again the need for
a code of conduct. This commit adds one.

Closes: #737

Signed-off-by: Alexey Ovchinnikov <aovchinn@redhat.com>

Author: a-ovchinnikov

CODE_OF_CONDUCT.md

@@ -0,0 +1,28 @@
+# Hermeto Code of Conduct
+
+By contributing to Hermeto in any form (via submitting a pull request,
+creating an issue, discussion or participating in any conversation in
+the project repository) one agrees to abide by the principles outlined
+in this document.
+
+1. Adhere to [contributor covenant][] Code of Conduct which is applicable
+   word for word to this project;
+1. Adhere to [contribution guidelines][];
+1. Adhere to [AI contribution policy][];
+1. Be respectful to peers in choice of language and in choice of
+   topics to bring up; remember that the project has limited resources and
+   plans for years to come, these resources cannot be spent at will;
+1. Do not generate noise in the project, AI-assisted or hand-crafted: low-effort
+   submissions for the sake of submitting will be treated as such and can lead
+   to a ban.
+
+Whether some activity violates the code of conduct is ultimately decided
+by project maintainers who will issue a warning or, if warnings are not heeded,
+ban a violating contributor from participation for a period of time chosen
+at their discretion. A violation could be reported using standard GitHub mechanisms.
+A maintainer will act as an arbiter in case any concerns
+of code of conduct breach arise.
+
+[contribution guidelines]: https://github.com/hermetoproject/hermeto/blob/main/CONTRIBUTING.md
+[contributor covenant]: https://www.contributor-covenant.org/version/2/0/code_of_conduct/
+[AI contribution policy]: https://github.com/hermetoproject/hermeto/blob/main/AI_CONTRIBUTION_POLICY.md