add den pattern

modules/features/default.nix

@@ -0,0 +1,18 @@
+{ lib, ... }:
+let
+  modulesDir = ../.;
+  moduleDirs = builtins.readDir modulesDir;
+
+  excludeDirs = [ "home" "features" ];
+
+  dirEntries = lib.filterAttrs
+    (name: type: type == "directory" && !builtins.elem name excludeDirs)
+    moduleDirs;
+in
+{
+  options.features.modules = lib.mkOption {
+    type = lib.types.attrs;
+    default = { };
+    description = "Auto-generated feature module options tree";
+  };
+}