Debugger_Disassembler.cpp: add GPL boilerplate text

source/Debugger/Debugger_Disassembler.cpp

@@ -1,3 +1,26 @@
+/*
+AppleWin : An Apple //e emulator for Windows
+
+Copyright (C) 1994-1996, Michael O'Brien
+Copyright (C) 1999-2001, Oliver Schmidt
+Copyright (C) 2002-2005, Tom Charlesworth
+Copyright (C) 2006-2021, Tom Charlesworth, Michael Pohoreski, Nick Westgate
+
+AppleWin is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+AppleWin 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with AppleWin; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
 #include "StdAfx.h"
 
 #include "Debug.h"