add den pattern

modules/core/common.nix

@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+let
+  dirModules = config.features.modules.core or { };
+in
+{
+  config = lib.mkIf ((dirModules.enable or false) && (dirModules.common.enable or true)) {
+    nixpkgs.config.allowUnfree = true;
+
+    nix.settings.experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+
+    users.defaultUserShell = pkgs.zsh;
+
+    environment.systemPackages = with pkgs; [
+      chromium
+      gnumake
+      jetbrains-toolbox
+      fastfetch
+      jq
+    ];
+
+    security.rtkit.enable = true;
+
+    system.stateVersion = "25.11";
+  };
+}