Added introduction, architecture section

Updated license header on new files.

Change-Id: Ic44db303ab935099698f8c6547904802381fce5c
diff --git a/overview/3gpp-compliance-5g.rst b/overview/3gpp-compliance-5g.rst
index 94fc629..c58adad 100644
--- a/overview/3gpp-compliance-5g.rst
+++ b/overview/3gpp-compliance-5g.rst
@@ -1,3 +1,7 @@
+..
+   SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+   SPDX-License-Identifier: Apache-2.0
+
 .. _5g-compliance:
 
 5G - 3GPP Release Compliance