Add doc submodule for usecase-ui

Change-Id: I24d1254cf2924df46d394a06b68470b3f814c130
Issue-Id: USECASEUI-48
Signed-off-by: shentao <shentao@chinamobile.com>
diff --git a/docs/release/repolist.rst b/docs/release/repolist.rst
index cf7ba34..b6a1807 100644
--- a/docs/release/repolist.rst
+++ b/docs/release/repolist.rst
@@ -78,3 +78,4 @@
    vnfrqts/guidelines <../submodules/vnfrqts/guidelines.git/docs/index>
    vnfrqts/requirements <../submodules/vnfrqts/requirements.git/docs/index>
    vnfsdk/model <../submodules/vnfsdk/model.git/docs/index>
+   usecase-ui <../submodules/usecase-ui.git/docs/index>