[VOL-4597] Added Voltha Test Automation Documentation

Change-Id: I77a823c3d6c84f847455fb63e4dc38c8392e7f10
diff --git a/index.rst b/index.rst
index 821b99d..5908500 100644
--- a/index.rst
+++ b/index.rst
@@ -168,6 +168,7 @@
    VOLTHA system tests <voltha-system-tests/README.md>
    testing/index.rst
    testing/memory_usage_pprof.rst
+   testing/voltha_test_automation.rst
 
 .. toctree::
    :maxdepth: 1