Add releasenote to tag the Tempest for Yoga release

Change-Id: Ide70ba2077caeef8c3b30a2399861aa5261d0bdc
diff --git a/releasenotes/notes/tempest-yoga-release-66e8484b9a402e9f.yaml b/releasenotes/notes/tempest-yoga-release-66e8484b9a402e9f.yaml
new file mode 100644
index 0000000..e41e31d
--- /dev/null
+++ b/releasenotes/notes/tempest-yoga-release-66e8484b9a402e9f.yaml
@@ -0,0 +1,18 @@
+---
+prelude: |
+    This release is to tag Tempest for OpenStack Yoga release.
+    This release marks the start of Yoga release support in Tempest.
+    After this release, Tempest will support below OpenStack Releases:
+
+    * Yoga
+    * Xena
+    * Wallaby
+    * Victoria
+    * Ussuri
+
+    Current development of Tempest is for OpenStack Zed development
+    cycle. Every Tempest commit is also tested against master during
+    the Zed cycle. However, this does not necessarily mean that using
+    Tempest as of this tag will work against a Zed (or future release)
+    cloud.
+    To be on safe side, use this tag to test the OpenStack Yoga release.