added nix flakes

flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "The 420-320-AH course";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+     flake-utils.lib.eachDefaultSystem (system:
+       let
+         pkgs = nixpkgs.legacyPackages.${system};
+         git-hash = if (self ? rev) then builtins.substring 0 8 self.rev else "dirty";
+         last-updated = if (self ? lastModified) then builtins.toString self.lastModified else "0";
+         
+      
+        python = pkgs.python3.withPackages(ps: with ps; [numpy
+                                                         pandas
+                                                         requests
+                                                         ipdb
+                                                         matplotlib
+                                                         duckdb
+                                                         pyarrow
+                                                         jupyter
+                                                         pytest
+                                                         faker]);
+       in
+       {
+         packages = {};
+         devShells.default = pkgs.mkShell {
+            buildInputs = with pkgs; [deno
+                                      python];
+            shellHook = ''
+            alias build-docs=${pkgs.deno}/bin/deno doc --html --name="Programmation Client II" --output=./docs/   ./modules-examples/mod.js
+            '';
+         };
+       }
+     );
+}