Add Code Of Conduct

This adopts the Contributor Covenant as the Code of Conduct
for all project spaces.
4 jobs for code-of-conduct in 28 minutes and 13 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Check
passed #367039
check

00:00:24

 
  Test
passed #367040
flatpak

00:27:21

 
  Review
passed #367041
review

00:00:27

manual #367042
allowed to fail manual
stop_review