Add all of iogamaster modules

modules/nixos/desktop/addons/gtklock/default.nix

@@ -0,0 +1,37 @@
+{
+  options,
+  config,
+  lib,
+  pkgs,
+  inputs,
+  ...
+}:
+with lib;
+with lib.frajul; let
+  cfg = config.desktop.addons.gtklock;
+  inherit (inputs.nix-colors.colorschemes.${builtins.toString config.desktop.colorscheme}) palette;
+in {
+  options.desktop.addons.gtklock = with types; {
+    enable = mkBoolOpt false "Enable or disable the gtklock screen locker.";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      gtklock
+    ];
+    security.pam.services.gtklock = {};
+
+    home.configFile."gtklock/style.css".text = ''
+      window {
+         background-size: cover;
+         background-repeat: no-repeat;
+         background-position: center;
+         background-color: #${palette.base00};
+      }
+
+      clock-label {
+          color: #${palette.base05};
+      }
+    '';
+  };
+}