add GPL license in README

README

@@ -1,4 +1,31 @@
 
+/*///////////////////////////////////////////////////////////////////
+////                                                             ////
+////  Author: Sean Chen                                          ////
+////          [email protected]                               ////
+////                                                             ////
+////                                                             ////
+/////////////////////////////////////////////////////////////////////
+////                                                             ////
+//// Copyright (C) 2013                                          ////
+////                                                             ////
+//// This source file may be used and distributed without        ////
+//// restriction provided that this copyright statement is not   ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer.////
+////                                                             ////
+//// This source file is free software; you can redistribute it  ////
+//// and/or modify it under the terms of the GNU Lesser General  ////
+//// Public License as published by the Free Software Foundation.////
+////                                                             ////
+//// This source 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 Lesser General Public License for more////
+//// details. http://www.gnu.org/licenses/lgpl.html              ////
+////                                                             ////
+///////////////////////////////////////////////////////////////////*/
+
 AXI BFM standard protocol checker
   supported
       read/write phase check