added kmscon

nixos/system/kmscon/default.nix

@@ -0,0 +1,15 @@
+{ pkgs, ... }:
+{
+  services.kmscon = {
+    enable = true;
+    fonts = [
+      {
+        name = "JetBrainsMono Nerd Font";
+        package = pkgs.nerd-fonts.jetbrains-mono;
+      }
+    ];
+    extraConfig = ''
+      font-size=12
+    '';
+  };
+}