Add device-management-interface documentation

Change-Id: I01f58e3d1cd8cd968e995bb912f14c0937034408
diff --git a/conf.py b/conf.py
index 4be53dd..175d6e0 100644
--- a/conf.py
+++ b/conf.py
@@ -282,6 +282,7 @@
                     r'https://github.com/opencord/voltctl/blob/master/LICENSE',
                     r'https://github.com/ciena/kind-voltha#voltha-up-configuration-options',
                     r'https://www.sphinx-doc.org',
+                    r'https://github.com/opencord/bbsim/blob/master/docs/source/DMI_Server_README'
                     ]
 
 # -- Configure recommonmark to use AutoStructify -----------------------------