Adding modeling/modelspec project

Prepare to publish information model, data models, and glossary

Change-Id: I19e820ea33ed82ee61d57a38adf5ca7ab2fb56bf
Issue-ID: DOC-88
Signed-off-by: Rich Bennett <rb2745@att.com>
diff --git a/.gitmodules b/.gitmodules
index 92d9937..98ed263 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -80,3 +80,6 @@
 [submodule "docs/submodules/msb/swagger-sdk.git"]
 	path = docs/submodules/msb/swagger-sdk.git
 	url = ../msb/swagger-sdk
+[submodule "docs/submodules/modeling/modelspec.git"]
+	path = docs/submodules/modeling/modelspec.git
+	url = ../modeling/modelspec