feat(sddm): init module

modules/nixos/sddm.nix

@@ -0,0 +1,16 @@
+{ config, lib, pkgs, ... }:
+
+let cfg = config.sydnix.sddm;
+in {
+  options.sydnix.sddm = {
+    enable = lib.mkEnableOption "SDDM";
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.displayManager.sddm = {
+      enable = true;
+      wayland.enable = true;
+      autoNumlock = true;
+    };
+  };
+}