Added SDC SDKs section to Read the Docs

Added a section describing all the SDC SDKs

Change-Id: I223f569353b8382856811afd9fd9bf8e13253639
Issue-Id: SDC-579
Signed-off-by: Idan Amit <ia096e@intl.att.com>
(cherry picked from commit a4a1e1fdf20d274e047a8f92dab4872172520167)
diff --git a/docs/index.rst b/docs/index.rst
index cc71b45..193734d 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -16,3 +16,4 @@
    installation.rst
    logging.rst
    release-notes.rst
+   sdcsdks.rst
\ No newline at end of file