Add releasenote to tag the end of support for Stein

This relesenote also mark end of support for Stein release
in Patrole as it is in EM state[1].

[1] https://releases.openstack.org/

Change-Id: I8f7d60e8a8e1766e14b37cbcbc3649c212520d00
diff --git a/releasenotes/notes/end-of-support-for-stein-8b93f530ae9b7331.yaml b/releasenotes/notes/end-of-support-for-stein-8b93f530ae9b7331.yaml
new file mode 100644
index 0000000..b148292
--- /dev/null
+++ b/releasenotes/notes/end-of-support-for-stein-8b93f530ae9b7331.yaml
@@ -0,0 +1,12 @@
+---
+prelude: |
+    This is an intermediate release during the Wallaby development cycle to
+    mark the end of support for EM Stein release in Patrole.
+    After this release, Patrole will support below OpenStack Releases:
+
+    * Victoria
+    * Ussuri
+    * Train
+
+    Current development of Patrole is for OpenStack Wallaby development
+    cycle.