Added License Notice Statement

NOTICE.txt

@@ -2,6 +2,8 @@ Media Insights on AWS
 
 Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
+Licensed under the Apache License Version 2.0 (the "License"). You may not use this file except in compliance with the License. A copy of the License is located at http://www.apache.org/licenses/ or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, express or implied. See the License for the specific language governing permissions and limitations under the License.
+
 **********************
 THIRD PARTY COMPONENTS
 **********************