Overview document created

The overview document targets to provide the reader with a basic understanding
on ONAP and its basic functional description.The doc also provides insight to
Benefit of ONAP, licenses needed, basic releases etc.
Issue-ID: DOC-364

Change-Id: I87c10896dc308d24d5aa8b54d920545372ffc41d
Signed-off-by: Noemi Wagner <noemi.wagner@nokia.com>
diff --git a/docs/release/index.rst b/docs/release/index.rst
index e7d77cf..c27ed91 100644
--- a/docs/release/index.rst
+++ b/docs/release/index.rst
@@ -1,8 +1,12 @@
 .. This work is licensed under a Creative Commons Attribution 4.0
    International License. http://creativecommons.org/licenses/by/4.0
 
+
+.. _casablancarelease-notes:
+
 Casablanca Release Notes
 ^^^^^^^^^^^^^^^^^^^^^^^^
+
 This page is the ONAP Casablanca Release Notes. The first release was labelled
 Amsterdam, second release Beijing and subsequent major release will be named
 using city names.
@@ -199,7 +203,7 @@
 
 ONAP Maturity Testing Notes
 ===========================
-For the Casablanca release, ONAP continues to improve in multiple areas of Scalability, Security, Stability and Performance (S3P) metrics.

+For the Casablanca release, ONAP continues to improve in multiple areas of Scalability, Security, Stability and Performance (S3P) metrics.
 
 The Integration team ran the 72 hours stability testing (100% passing rate) and full resilience testing (96.9% passing rate) at ONAP OpenLabs. More details in :ref:`ONAP Maturity Testing Notes <integration-s3p>`