Add LICENSE file

LICENSE

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+  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+
+  Snes9x homepage: http://www.snes9x.com/
+
+  Permission to use, copy, modify and/or distribute Snes9x in both binary
+  and source form, for non-commercial purposes, is hereby granted without
+  fee, providing that this license information and copyright notice appear
+  with all copies and any derived work.
+
+  This software is provided 'as-is', without any express or implied
+  warranty. In no event shall the authors be held liable for any damages
+  arising from the use of this software or it's derivatives.
+
+  Snes9x is freeware for PERSONAL USE only. Commercial users should
+  seek permission of the copyright holders first. Commercial use includes,
+  but is not limited to, charging money for Snes9x or software derived from
+  Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
+  using Snes9x as a promotion for your commercial product.
+
+  The copyright holders request that bug fixes and improvements to the code
+  should be forwarded to them so everyone can benefit from the modifications
+  in future versions.
+
+  Super NES and Super Nintendo Entertainment System are trademarks of
+  Nintendo Co., Limited and its subsidiary companies.
+
+
+-------------------------------------------------------------------------------
+
+Some parts included in Snes9x are usually available under a different license,
+their authors have granted exception for their use in Snes9x (and/or they are
+licensed as LGPL):
+ - JMA: GPL/LGPL, see jma/license.txt
+ - GTK port: dual licensed as LGPL, see gtk/doc/LICENSE
+ - snes_ntsc: LGPL, see filter/snes_ntsc-license.txt
+ - xBRZ: GPLv3, see filter/xbrz-license.txt