Add releasenote to tag the Tempest for Rocky release

This commit adds the releasenote to tag Tempest for Rocky
and needed for version 19.0.0 to release.

Change-Id: I4ae8245e60580a77da477318c12e9b82e5e18351
diff --git a/releasenotes/notes/tempest-rocky-release-0fc3312053923380.yaml b/releasenotes/notes/tempest-rocky-release-0fc3312053923380.yaml
new file mode 100644
index 0000000..e9c77a6
--- /dev/null
+++ b/releasenotes/notes/tempest-rocky-release-0fc3312053923380.yaml
@@ -0,0 +1,16 @@
+---
+prelude: >
+    This release is to tag the Tempest for OpenStack Rocky release.
+    After this release, Tempest will support below OpenStack Releases:
+
+      * Rocky
+      * Queens
+      * Pike
+      * Ocata
+
+    Current development of Tempest is for OpenStack Stein development
+    cycle. Every Tempest commit is also tested against master during
+    the Stein cycle. However, this does not necessarily mean that using
+    Tempest as of this tag will work against a Stein (or future release)
+    cloud.
+    To be on safe side, use this tag to test the OpenStack Rocky release.
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