nix-shell support

shell.nix

@@ -0,0 +1,8 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    # nativeBuildInputs is usually what you want -- tools you need to run
+    nativeBuildInputs = with pkgs.buildPackages; [ 
+        python312
+        uv
+    ];
+}