Added missing source and copyright header to file

pinning/named_pin/arduino_mega2560

@@ -1,11 +1,23 @@
 #
-#   Named Pin Configuration File
+# Named Pin Configuration File for Arduino Mega2560
+# based on https://www.arduino.cc/en/Hacking/PinMapping2560
 #
-# You can assign names to your microcontroller's pins here.
-# Keep in mind that this names must consist of alphanumeric 
-# characters only!
+# Copyright (c) 2016 by Erik Kunze <ethersex@erik-kunze.de>
 #
-# Every line starting with a hash sign (#) is a comment.
+# This program 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 3 of the License, or
+# (at your option) any later version.
+#
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #
 #
 # PIN | IN/OUT | When active? | Name