GUI: adding LoadingService module.

Change-Id: I73f479965416a2e48506854c6b4ea543e6a37ad5
diff --git a/web/gui/src/main/webapp/app/fw/layer/loading.css b/web/gui/src/main/webapp/app/fw/layer/loading.css
new file mode 100644
index 0000000..9c8d354
--- /dev/null
+++ b/web/gui/src/main/webapp/app/fw/layer/loading.css
@@ -0,0 +1,27 @@
+/*
+ *  Copyright 2015 Open Networking Laboratory
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/*
+ ONOS GUI -- Loading Service -- CSS file
+ */
+
+#loading-anim {
+    position: fixed;
+    top: 50%;
+    left: 50%;
+    -webkit-transform: translate(-50%, -50%);
+    transform: translate(-50%, -50%);
+}