add shell.nix

shell.nix

@@ -0,0 +1,16 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.python312
+    pkgs.python312Packages.networkx
+    pkgs.python312Packages.matplotlib
+    pkgs.python312Packages.requests
+    pkgs.python312Packages.bleach
+    pkgs.python312Packages.beautifulsoup4
+    pkgs.python312Packages.pygraphviz
+  ];
+  shellHook = ''
+    python main.py
+  '';
+}