add exfat drivers

modules/root-programs.nix

@@ -3,6 +3,7 @@
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
+    exfatprogs
     usbutils  
     wget
     nano
@@ -14,6 +15,6 @@
     tmux
     hdparm
 
-    python3
+    python3    
    ];
 }