add initial solution (made with copilot)

config/config.php.template

@@ -0,0 +1,10 @@
+<?php
+return [
+    'external_api_base_url' => 'https://api.example.com',
+    'rate_limiter_driver' => 'file', // o 'memory'
+    // configuration for file-based rate limiter
+    'rate_limit_storage_dir' => sys_get_temp_dir() . '/api_rate_limit',
+    // configuration for memory-based rate limiter
+    'rate_limit_requests' => 100,
+    'rate_limit_window_seconds' => 60,
+];