Add dev-shell flake

flake.nix

@@ -0,0 +1,22 @@
+{
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  outputs = { nixpkgs, ... }:
+    let
+      forAllSystems = f:
+        nixpkgs.lib.genAttrs [
+          "x86_64-linux"
+          "aarch64-linux"
+        ]
+          (s: f nixpkgs.legacyPackages.${s});
+    in
+    {
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            kicad
+          ];
+        };
+      });
+    };
+}