DOC added vnfrqts/testcases

Adding VNF Requirements Test Cases project
This should be at the same level as the VNF Requirements and VNF Guidelines projects
Followed this guide http://onap.readthedocs.io/en/latest/guides/onap-developer/how-to-use-docs/include-documentation.html#setup-project-repositories-s

Change-Id: I7473a3ff71960d47e98b386a6ff1afe6282d72a5
Issue-ID: VNFRQTS-53
Signed-off-by: stark, steven <ss820f@att.com>
diff --git a/.gitmodules b/.gitmodules
index 2d774a9..3fde0c9 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -311,3 +311,6 @@
 [submodule "docs/submodules/music/distributed-kv-store.git"]
 	path = docs/submodules/music/distributed-kv-store.git
 	url = ../music/distributed-kv-store
+[submodule "docs/submodules/vnfrqts/testcases.git"]
+	path = docs/submodules/vnfrqts/testcases.git
+	url = ../vnfrqts/testcases