Add About doc page for Aether System Tests

Change-Id: I3bb158d2437ce422b84cbccf17ce21f9d01dab0f
diff --git a/index.rst b/index.rst
index 866ff58..6219c74 100644
--- a/index.rst
+++ b/index.rst
@@ -34,12 +34,14 @@
    edge_deployment/enb_installation
    edge_deployment/troubleshooting
 
+
 .. toctree::
    :maxdepth: 3
-   :caption: Test Automation
+   :caption: Aether Test Automation
    :hidden:
    :glob:
 
+   testing/about_system_tests
    testing/acceptance_specification
 
 .. toctree::