[xmonad] XMonad.Prompt.File (attached)

Hello, I had need in my config for a filename prompt. XMonad-Contrib contains XMonad.Prompt.Directory, so I just copied it and made the appropriate substitutions to make XMonad.Prompt.File. It would be great if this could be added to xmonad-contrib so it will be there for the next person who needs this functionality. -- John Foerch