Add releasenote to tag the Patrole for Train release

This commit adds the releasenote to tag Patrole for Train
and needed for version 0.7.0 to release.

Change-Id: Ie654d8634b887eaf1b24a7dba21751c3d18e088c
diff --git a/releasenotes/notes/patrole-train-release-7d493ff5039f1715.yaml b/releasenotes/notes/patrole-train-release-7d493ff5039f1715.yaml
new file mode 100644
index 0000000..ad3acd8
--- /dev/null
+++ b/releasenotes/notes/patrole-train-release-7d493ff5039f1715.yaml
@@ -0,0 +1,17 @@
+---
+prelude: |
+    This release is to tag the Patrole for OpenStack Train release.
+    This release marks the start of Train release support in Patrole.
+    After this release, Patrole will support below OpenStack Releases:
+
+    * Train
+    * Stein
+    * Rocky
+    * Queens
+
+    Current development of Patrole is for OpenStack Ussuri development
+    cycle. Every Patrole commit is also tested against master during
+    the Ussuri cycle. However, this does not necessarily mean that using
+    Patrole as of this tag will work against a Ussuri (or future release)
+    cloud.
+    To be on safe side, use this tag to test the OpenStack Train release.