nixos/usbtop: Add module to install usbtop and to enable kernel module

nixos/modules/module-list.nix

@@ -152,6 +152,7 @@
   ./programs/tmux.nix
   ./programs/tsm-client.nix
   ./programs/udevil.nix
+  ./programs/usbtop.nix
   ./programs/venus.nix
   ./programs/vim.nix
   ./programs/wavemon.nix

nixos/modules/programs/usbtop.nix

@@ -0,0 +1,21 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.usbtop;
+in {
+  options = {
+    programs.usbtop.enable = mkEnableOption "usbtop and required kernel module";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      usbtop
+    ];
+
+    boot.kernelModules = [
+      "usbmon"
+    ];
+  };
+}