Added nix darwin

nixos/hosts/kylekrein-air/default.nix

@@ -0,0 +1,25 @@
+{ self, pkgs, ... }: {
+      # List packages installed in system profile. To search by name, run:
+      # $ nix-env -qaP | grep wget
+      environment.systemPackages = with pkgs;[ 
+	neovim
+	kitty
+	yazi
+        ];
+
+      # Necessary for using flakes on this system.
+      nix.settings.experimental-features = "nix-command flakes";
+
+      # Enable alternative shell support in nix-darwin.
+      # programs.fish.enable = true;
+
+      # Set Git commit hash for darwin-version.
+      system.configurationRevision = self.rev or self.dirtyRev or null;
+
+      # Used for backwards compatibility, please read the changelog before changing.
+      # $ darwin-rebuild changelog
+      system.stateVersion = 5;
+
+      # The platform the configuration will be used on.
+      nixpkgs.hostPlatform = "aarch64-darwin";
+}