Add licenses (#367)

src/frontend/templates/order.html

@@ -1,3 +1,19 @@
+<!--
+ Copyright 2020 Google LLC
+
+ 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.
+-->
+
 {{ define "order" }}
     {{ template "header" . }}
     <div {{ with $.platform_css }} class="{{.}}" {{ end }}>