Add license to .github

Author: balthisar

.github/LICENSE

@@ -0,0 +1,50 @@
+# HTML Tidy
+
+## HTML parser and pretty printer
+
+Copyright (c) 1998-2016 World Wide Web Consortium
+(Massachusetts Institute of Technology, European Research 
+Consortium for Informatics and Mathematics, Keio University).
+All Rights Reserved.
+
+Additional contributions (c) 2001-2016 University of Toronto, Terry Teague, 
+@geoffmcl, HTACG, and others.
+
+### Contributing Author(s):
+
+  Dave Raggett <[email protected]>
+
+The contributing author(s) would like to thank all those who
+helped with testing, bug fixes and suggestions for improvements. 
+This wouldn't have been possible without your help.
+
+## COPYRIGHT NOTICE:
+
+This software and documentation is provided "as is," and
+the copyright holders and contributing author(s) make no
+representations or warranties, express or implied, including
+but not limited to, warranties of merchantability or fitness
+for any particular purpose or that the use of the software or
+documentation will not infringe any third party patents,
+copyrights, trademarks or other rights. 
+
+The copyright holders and contributing author(s) will not be held
+liable for any direct, indirect, special or consequential damages
+arising out of any use of the software or documentation, even if
+advised of the possibility of such damage.
+
+Permission is hereby granted to use, copy, modify, and distribute
+this source code, or portions hereof, documentation and executables,
+for any purpose, without fee, subject to the following restrictions:
+
+1. The origin of this source code must not be misrepresented.
+2. Altered versions must be plainly marked as such and must
+not be misrepresented as being the original source.
+3. This Copyright notice may not be removed or altered from any
+source or altered source distribution.
+
+The copyright holders and contributing author(s) specifically
+permit, without fee, and encourage the use of this source code
+as a component for supporting the Hypertext Markup Language in
+commercial products. If you use this source code in a product,
+acknowledgement is not required but would be appreciated.