add submodule to user manual

.gitmodules

@@ -3,3 +3,7 @@
 	path = owncloud-android-library
 	url = git://github.com/owncloud/android-library.git
 	branch = develop
+[submodule "ocdoc"]
+	path = user_manual/ocdoc
+	url = https://github.com/owncloud/documentation
+	branch = master

user_manual/ocdoc

@@ -0,0 +1 @@
+Subproject commit 343496c792616459e8204b6614fd42a1b16a6d68