Add license header. (#6)

bin/index.js

@@ -1,5 +1,17 @@
 #!/usr/bin/env node
 
+/***************************************************************************************
+ * (c) 2019 Adobe. All rights reserved.
+ * This file is licensed to you 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 REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ ****************************************************************************************/
+
 const path = require('path');
 const validate = require('../lib/index');
 const extensionDescriptor = require(path.resolve('extension.json'));
@@ -11,4 +23,3 @@ if (result) {
 } else {
   console.log('The extension appears to be well-formed.');
 }
-