Add optf cmso module to the guides

Adding cmso index files to the onap-developer/developing link

Change-Id: I4eb91c262def0df52793e659e7f12cbd41fb24ed
Signed-off-by: vrvarma <vv8305@att.com>
Issue-ID: OPTFRA-394
diff --git a/docs/guides/onap-developer/developing/index.rst b/docs/guides/onap-developer/developing/index.rst
index 345aca8..127b175 100644
--- a/docs/guides/onap-developer/developing/index.rst
+++ b/docs/guides/onap-developer/developing/index.rst
@@ -244,6 +244,7 @@
 
    ../../../submodules/optf/has.git/docs/index
    ../../../submodules/optf/osdf.git/docs/index
+   ../../../submodules/optf/cmso.git/docs/index
 
 Policy Framework
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