Add LCM API to CCSDK readthedocs

Add missing LCM API doc to ccsdk documentation

Change-Id: I5cd2addad7f9ff20a09eea3b6083b9f94801af4c
Issue-ID: CCSDK-476
Signed-off-by: Timoney, Dan (dt5972) <dt5972@att.com>
diff --git a/docs/sli/offeredapis.rst b/docs/sli/offeredapis.rst
index 7a75245..9a78535 100644
--- a/docs/sli/offeredapis.rst
+++ b/docs/sli/offeredapis.rst
@@ -10,6 +10,7 @@
 
    apis/asdcApi.rst
    apis/dataChange.rst
+   apis/lcm.rst
    apis/sliapi.rst