Add releasenotes page for v0.3.0

This PS is to add releasenotes page for v0.3.0 (current) release
of Patrole.

Change-Id: I7a4701143407dafb818a1ceb573119ebc2cb0365
diff --git a/releasenotes/source/v0.3.0.rst b/releasenotes/source/v0.3.0.rst
new file mode 100644
index 0000000..5b6f04a
--- /dev/null
+++ b/releasenotes/source/v0.3.0.rst
@@ -0,0 +1,6 @@
+====================
+v0.3.0 Release Notes
+====================
+
+.. release-notes:: 0.3.0 Release Notes
+   :version: 0.3.0