started modifing configuration structure

system/nvidia/default.nix

@@ -0,0 +1,13 @@
+{ config, lib, pkgs, ... }:
+{
+  services.xserver.videoDrivers = [ "nvidia" ];
+
+  hardware.nvidia = {
+    modesetting.enable = true;
+    powerManagement.enable = false;
+    powerManagement.finegrained = false;
+    open = true;
+    nvidiaSettings = true;
+    package = config.boot.kernelPackages.nvidiaPackages.production;
+  };
+}