[Cloud Run] Add license to file (#1950)

Author: averikitsch

run/markdown-preview/editor/index.js

@@ -1,7 +1,21 @@
+// 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
+//
+//     https://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.
+
 const {app} = require('./app');
 const pkg = require('./package.json');
 const PORT = process.env.PORT || 8080;
 
 app.listen(PORT, () =>
   console.log(`${pkg.name} listening on port ${PORT}`)
-);
+);