Add keystone team office hours meeting

Change-Id: I106757f4ee19870f483950a45dbd2cc262dd62eb

meetings/keystone-team-office-hours.yaml

@@ -0,0 +1,13 @@
+project:  Keystone Team Office Hours
+meeting_id: keystone
+agenda_url: https://etherpad.openstack.org/p/keystone-office-hours-topics
+schedule:
+  - time:       '1700'
+    day:        Tuesday
+    irc:        openstack-keystone
+    frequency:  weekly
+    start_date: 20190514
+chair: Colleen Murphy (cmurphy)
+description:  >
+  Office hours are used to work together as a team on various topics that don't
+  necessarily belong in a meeting, such as group bug triage or patch review.