Added NOTICE

Author: LinkedIn-Learning-A1

NOTICE

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+Copyright 2019 LinkedIn Corporation
+All Rights Reserved.
+
+Licensed under the LinkedIn Learning Exercise File License (the "License").
+See LICENSE in the project root for license information.
+
+Please note, this project may automatically load third party code from external 
+repositories (for example, NPM modules, Composer packages, or other dependencies). 
+If so, such third party code may be subject to other license terms than as set 
+forth above. In addition, such third party code may also depend on and load 
+multiple tiers of dependencies. Please review the applicable licenses of the 
+additional dependencies.