added sddm with autologin (only one needed)

modules/features/sddm/autologin.nix

@@ -0,0 +1,21 @@
+{
+  self,
+  inputs,
+  ...
+}: {
+  flake.nixosModules.sddm-autologin = {
+    pkgs,
+    lib,
+    ...
+  }: let
+    modules = with self.nixosModules; [
+      sddm
+    ];
+  in {
+    imports = modules;
+    services.displayManager = {
+      autoLogin.enable = true;
+      autoLogin.user = "user01";
+    };
+  };
+}