add templates

templates/arduino.nix

@@ -0,0 +1,29 @@
+{
+  description = "Example flake with a devShell";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  outputs = { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
+    in {
+      devShells.${system}.arduino = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          hello
+          nodejs
+          unzip
+          unrar
+          vscode.fhs
+          pkgsi686Linux.glibc
+          pkgsCross.avr.buildPackages.gcc
+          platformio-core
+          glibc_multi
+          clang
+          clang-tools
+        ];
+        shellHook = ''
+          echo "Welcome to the devShell!"
+        '';
+      };
+    };
+}