Adding a license (GPL 3.0)

hfsc

@@ -1,7 +1,22 @@
 #!/bin/bash
 # encoding: UTF-8
+#
+# HFSC helper script
+# (c) 2006-2011 Maciej Bliziński
+# http://automatthias.wordpress.com/
+#
+#   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, version 3 of the License.
+#
+#   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, see <http://www.gnu.org/licenses/>.
 # 
-# Maciej Bliziński, http://automatthias.wordpress.com/
 #
 # References:
 # http://www.voip-info.org/wiki/view/QoS+Linux+with+HFSC