Add SDNC Frankfurt release notes

Add release notes for SDNC Frankfurt release

Change-Id: I8fa079a305351be8aa9cf298274528fda572e746
Issue-ID: SDNC-1172
Signed-off-by: Dan Timoney <dtimoney@att.com>

Former-commit-id: 3eb32648ea58265ff87d0bc3b1867d0ce0006d69
diff --git a/docs/index.rst b/docs/index.rst
index b077895..8a25801 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -2,8 +2,8 @@
 .. http://creativecommons.org/licenses/by/4.0
 .. _master_index:
 
-SDNC Northbound
-===============
+Network Controller (SDNC)
+=========================
 
 .. toctree::
    :maxdepth: 1
@@ -14,6 +14,7 @@
    delivery.rst
    logging.rst
    installation.rst
+   cert_installation.rst
    configuration.rst
    build.rst
    humaninterfaces.rst