GUI extension Yeoman generator

Change-Id: If6b3fae44e4ee8a7bde36600cdc71d54d49fbf6e
diff --git a/generator-xos-gui-extension/generators/templates/xos-sample-gui-extension.yaml b/generator-xos-gui-extension/generators/templates/xos-sample-gui-extension.yaml
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+
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+
+
+tosca_definitions_version: tosca_simple_yaml_1_0
+
+description: <%= name %>
+
+imports:
+   - custom_types/xos.yaml
+
+topology_template:
+  node_templates:
+
+    # UI Extension
+    <%= name %>:
+      type: tosca.nodes.XOSGuiExtension
+      properties:
+        files: /xos/extensions/<%= name %>/vendor.js, /xos/extensions/<%= name %>/app.js