restructure everything

python/pyproject/nixpkgs/cli/package.nix

@@ -0,0 +1,20 @@
+{ python3
+}:
+
+python3.pkgs.buildPythonApplication {
+  pname = "hello";
+  version = "0.1";
+  src = ./.;
+
+  pyproject = true;
+  build-system = with python3.pkgs; [
+    # build-system.{requires,setup_requires}
+    setuptools
+  ];
+
+  dependencies = [
+    # Python package dependencies
+  ];
+
+  doCheck = false;
+}