Project: Create nix development shell and envrc file

.envrc

@@ -0,0 +1 @@
+use_nix

shell.nix

@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    nativeBuildInputs = with pkgs; [
+      ruff
+      poetry
+      python312
+      python312Packages.python-lsp-server
+    ];
+}