chore: add nix flake

flake.nix

@@ -0,0 +1,39 @@
+{
+  description = "Dev shell";
+
+  # Flake inputs
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  # Flake outputs
+  outputs = { self, nixpkgs, ... }:
+    let
+      allSystems = [
+        "x86_64-linux" # 64-bit Intel/AMD Linux
+        "aarch64-linux" # 64-bit ARM Linux
+        "x86_64-darwin" # 64-bit Intel macOS
+        "aarch64-darwin" # 64-bit ARM macOS
+      ];
+
+      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      devShells = forAllSystems ({ pkgs }: {
+        default =  pkgs.mkShell {
+          packages = (with pkgs; [
+            python313
+            onefetch
+            uv
+            ruff
+          ]);
+          shellHook = ''
+            onefetch
+            uv sync
+          '';
+        };
+      });
+    };
+}