Add policy submodule

Adding the policy/engine submodule.

Change-Id: I529b3adc3c3448613d01108801c1449d6fe524ab
Issue-ID: POLICY-190
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
diff --git a/.gitmodules b/.gitmodules
index 761a85a..bfb8014 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -48,3 +48,9 @@
 	url = ../aaf/authz
         branch = .
         ignore = dirty
+[submodule "docs/submodules/policy/engine.git"]
+	path = docs/submodules/policy/engine.git
+	url = ../policy/engine
+        branch = .
+        ignore = dirty
+