Adding License.

LICENSE

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+Legal Notices
+
+Microsoft and any contributors grant you a license to the Microsoft
+documentation and other content in this repository under the Creative Commons
+Attribution 3.0 International Public License
+(https://creativecommons.org/licenses/by/3.0/legalcode, see license-docs) and
+grant you a license to any code in the repository under the MIT License
+(https://opensource.org/licenses/MIT, see license-code file).
+
+Microsoft, Windows, Visual Studio and/or other Microsoft products and services
+referenced in the documentation may be either trademarks or registered
+trademarks of Microsoft in the United States and/or other countries. The
+licenses for this project do not grant you rights to use any Microsoft names,
+logos, or trademarks. Microsoft’s general trademark guidelines can be found at
+http://go.microsoft.com/fwlink/?LinkID=254653.
+
+Microsoft and any contributors reserve all others rights, whether under their
+respective copyrights, patents, or trademarks, whether by implication, estoppel
+or otherwise.