Add release notes page for v10.0.0

This commit adds a seperate release notes page for tempest 10.0.0
to clearly mark what is inclued in that.

Change-Id: Ia3e4672777e6f2fbf5823c3869fa33715db2f2bf
diff --git a/releasenotes/source/v10.0.0.rst b/releasenotes/source/v10.0.0.rst
new file mode 100644
index 0000000..38ed2ef
--- /dev/null
+++ b/releasenotes/source/v10.0.0.rst
@@ -0,0 +1,6 @@
+=====================
+v10.0.0 Release Notes
+=====================
+
+.. release-notes:: 10.0.0 Release Notes
+   :version: 10.0.0