release-note: stable-3.1
release-note: stable-3.1

stable-3.1 is approaching, so let's write our first release note.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

fgal/ceph-ansible,fgal/ceph-ansible