Expand license to include contributors

Author: richlander

license.txt

@@ -1,7 +1,10 @@
-Copyright (c) .NET Foundation. All rights reserved.
+Copyright (c) .NET Foundation and contributors. All rights reserved.
 
-Documentation is licensed under the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/legalcode). 
+Documentation is licensed under the Creative Commons Attribution 4.0
+International License (http://creativecommons.org/licenses/by/4.0/legalcode).
 
 Code is licensed under the MIT License (https://opensource.org/licenses/MIT).
 
-This license does not grant you rights to use any trademarks or logos of Microsoft. For Microsoft’s general trademark guidelines, go to http://go.microsoft.com/fwlink/?LinkID=254653.
+This license does not grant you rights to use any trademarks or logos of
+Microsoft. For Microsoft’s general trademark guidelines, go to
+http://go.microsoft.com/fwlink/?LinkID=254653.