git: add ring-client-ios submodule

[Guillaume R.: modified ci msg title for the precision sake]

Change-Id: I519ef02e2243eaeae296b58587ddd0fef429d481
Tuleap: #313
Signed-off-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>

.gitmodules

@@ -16,3 +16,6 @@
 [submodule "client-macosx"]
 	path = client-macosx
 	url = https://gerrit-ring.savoirfairelinux.com/ring-client-macosx
+[submodule "client-ios"]
+	path = client-ios
+	url = https://gerrit-ring.savoirfairelinux.com/ring-client-ios

client-ios @ a68931d4

+Subproject commit a68931d4c1281c74c86d43a60714fc06a87fb010