xmonad: Setup a basic xmonad config

modules/wm/xmonad/default.nix

@@ -9,6 +9,7 @@
         enable = true;
         enableContribAndExtras = true;
         config = ./config.hs;
+        extraPackages = hp: [ hp.dbus hp.monad-logger hp.xmonad-contrib ];
       };
     };
   };