Added submodule for policy apex-pdp

Issue-ID: POLICY-1161
Change-Id: Ibd09d03898ed2a3f9bdaae3d401111d0a8fe14e3
Signed-off-by: mmis <michael.morris@ericsson.com>
diff --git a/.gitmodules b/.gitmodules
index 886623f..c0e4198 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -333,3 +333,6 @@
 	url = ../aaf/sms
 	branch = .
 	ignore = dirty
+[submodule "docs/submodules/policy/apex-pdp.git"]
+	path = docs/submodules/policy/apex-pdp.git
+	url = ../policy/apex-pdp