🔧 Add shell.nix for reproductible dev environements

shell.nix

@@ -0,0 +1,37 @@
+with import <nixpkgs> { };
+
+let
+  pythonPackages = python3Packages;
+in pkgs.mkShell rec {
+  name = "localDevPythonEnv";
+  venvDir = "./.venv";
+  buildInputs = [
+    # A Python interpreter including the 'venv' module is required to bootstrap
+    # the environment.
+    pythonPackages.python
+
+    # This executes some shell code to initialize a venv in $venvDir before
+    # dropping into the shell
+    pythonPackages.venvShellHook
+
+    # Those are dependencies that we would like to use from nixpkgs, which will
+    # add them to PYTHONPATH and thus make them accessible from within the venv.
+    pythonPackages.numpy
+    pythonPackages.networkx
+    pythonPackages.matplotlib
+    pythonPackages.seaborn
+    pythonPackages.tqdm
+    pythonPackages.pygame
+  ];
+
+  # Run this command, only after creating the virtual environment
+  postVenvCreation = ''
+    pip install -e '.[dev,gui,planning,gym]'
+  ''; 
+
+  # Now we can execute any commands within the virtual environment.
+  # This is optional and can be left out to run pip manually.
+  postShellHook = ''
+  '';
+
+}