write auxiliary modules

[javier.a77aque at gmail.com (el javier!!!!)]

Hello everbody; I have a question:

How can write a module auxliary:
I try create a new file in modules/auxiliary with:

require 'msf/core'
module Msf

  p "My first module"
  Class Auxiliary::NameOfArchive < Msf::Auxiliary
  end
end

but no appear in the list of msfconsole

thanks for your time!