chore: add a nix flake

Author: JohannesRudolph

flake.lock

@@ -0,0 +1,16 @@
+{
+  description = "A flake that installs Node.js";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "aarch64-darwin"; # Change to your system if needed
+      pkgs = import nixpkgs { inherit system; };
+    in {
+      packages.${system}.default = pkgs.nodejs;
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = [ pkgs.nodejs ];
+      };
+    };
+}