ssh, avahi and stateversion added to core

modules/system/core/default.nix

@@ -21,6 +21,10 @@
         /etc/nixos/hardware-configuration.nix
       ]
       ++ modules;
+    services = {
+      openssh.enable = true;
+      avahi.enable = true;
+    };
     environment.systemPackages = with pkgs; [
       vim
       unzip
@@ -33,5 +37,6 @@
       curlWithGnuTls
       wget
     ];
+    system.stateVersion = "25.05";
   };
 }