add license statement

ixp-watch

@@ -1,5 +1,21 @@
 #!/bin/bash -v
 
+# This file is part of IXP Watch
+#
+# IXP Watch 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 v2.0 of the License.
+#
+# IXP Watch 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 v2.0
+# along with IXP Watch If not, see:
+#
+# http://www.gnu.org/licenses/gpl-2.0.html
+
 ################################################################################
 #### Local configuration. Things you WILL need to check                        #
 ################################################################################