docs: rename file to appease github
authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Tue, 2 Oct 2018 07:29:42 +0000 (09:29 +0200)
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Tue, 2 Oct 2018 07:29:42 +0000 (09:29 +0200)
Hopefully this will be enough to let github notice that we have
a coc now and display the green checkmark:
https://github.com/systemd/systemd/pull/10233#issuecomment-425918447

docs/CODE_OF_CONDUCT.md [moved from docs/code_of_conduct.md with 100% similarity]