Add license

Author: WorksButNotTested

COPYING

@@ -0,0 +1,50 @@
+              wxWindows Library Licence, Version 3.1
+              ======================================
+
+Copyright (c) 1998-2005 Julian Smart, Robert Roebling et al
+
+Everyone is permitted to copy and distribute verbatim copies
+of this licence document, but changing it is not allowed.
+
+                     WXWINDOWS LIBRARY LICENCE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+This library is free software; you can redistribute it and/or modify it
+under the terms of the GNU Library General Public Licence as published by
+the Free Software Foundation; either version 2 of the Licence, or (at your
+option) any later version.
+
+This library is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
+Licence for more details.
+
+You should have received a copy of the GNU Library General Public Licence
+along with this software, usually in a file named COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
+Floor, Boston, MA 02110-1301 USA.
+
+EXCEPTION NOTICE
+
+1. As a special exception, the copyright holders of this library give
+permission for additional uses of the text contained in this release of the
+library as licenced under the wxWindows Library Licence, applying either
+version 3.1 of the Licence, or (at your option) any later version of the
+Licence as published by the copyright holders of version 3.1 of the Licence
+document.
+
+2. The exception is that you may use, copy, link, modify and distribute
+under your own terms, binary object code versions of works based on the
+Library.
+
+3. If you copy code from files distributed under the terms of the GNU
+General Public Licence or the GNU Library General Public Licence into a
+copy of this library, as this licence permits, the exception does not apply
+to the code that you add in this way.  To avoid misleading anyone as to the
+status of such modified files, you must delete this exception notice from
+such code and/or adjust the licensing conditions notice accordingly.
+
+4. If you write modifications of your own for this library, it is your
+choice whether to permit this exception to apply to your modifications.  If
+you do not wish that, you must delete the exception notice from such code
+and/or adjust the licensing conditions notice accordingly.