Add release notes page for version 22.1.0

Tempest 22.1.0 has been released in Train but releasenote
page was not added for that.

Change-Id: I899d18ee33bd2b94d81f65b62a2b32f643a2d262
diff --git a/releasenotes/source/v22.1.0.rst b/releasenotes/source/v22.1.0.rst
new file mode 100644
index 0000000..6a4fd1f
--- /dev/null
+++ b/releasenotes/source/v22.1.0.rst
@@ -0,0 +1,6 @@
+=====================
+v22.1.0 Release Notes
+=====================
+
+.. release-notes:: 22.1.0 Release Notes
+   :version: 22.1.0