Link doc

Issue-Id: DCAEGEN2-109
Change-Id: If8b6dadcf3af0bf5982da1f0fc8fd2c99beb2f20
Signed-off-by: Lusheng Ji <lji@research.att.com>
diff --git a/.gitmodules b/.gitmodules
index 6962e28..7b8ef23 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -38,3 +38,8 @@
 	url = ../optf/has
         branch = .
         ignore = dirty
+[submodule "docs/submodules/dcaegen2.git"]
+	path = docs/submodules/dcaegen2.git
+	../dcaegen2
+        branch = .
+        ignore = dirty