added license info

Author: L1ghtn1ng

modules/auxiliary/admin/scada/modicon_command.rb

@@ -1,3 +1,10 @@
+##
+# This file is part of the Metasploit Framework and may be subject to
+# redistribution and commercial restrictions. Please see the Metasploit
+# web site for more information on licensing and terms of use.
+# http://metasploit.com/
+##
+
 require 'msf/core'
 
 class Metasploit3 < Msf::Auxiliary