Add KeyTester class for key press and release handling

.gitignore

@@ -11,3 +11,4 @@ dist/
 rats
 rats.spec
 .env
+release/

key.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+
+from engine import sdl2 as engine
+
+class KeyTester:
+    def __init__(self):
+        self.render_engine = engine.GameWindow(800, 600, 1, "Key Tester", 
+                                             key_callback=(self.key_pressed, self.key_released, None))
+        self.pressed_keys = []
+        self.last_key = "None"
+        
+    def key_pressed(self, key):
+        self.last_key = f"PRESSED: {key}"
+        if key not in self.pressed_keys:
+            self.pressed_keys.append(key)
+        print(f"Key pressed: {key}")
+        
+    def key_released(self, key):
+        self.last_key = f"RELEASED: {key}"
+        if key in self.pressed_keys:
+            self.pressed_keys.remove(key)
+        print(f"Key released: {key}")
+    
+    def update_display(self):
+        # Mostra l'ultimo tasto premuto/rilasciato
+        self.render_engine.draw_text(f"Last action: {self.last_key}", 
+                                   self.render_engine.fonts[20], (10, 10), 
+                                   engine.sdl2.ext.Color(255, 255, 255))
+        
+        # Mostra tutti i tasti attualmente premuti
+        pressed_text = "Currently pressed: " + ", ".join(self.pressed_keys) if self.pressed_keys else "Currently pressed: None"
+        self.render_engine.draw_text(pressed_text, 
+                                   self.render_engine.fonts[16], (10, 40), 
+                                   engine.sdl2.ext.Color(255, 255, 255))
+        
+        # Istruzioni
+        self.render_engine.draw_text("Press any key to test. ESC to quit.", 
+                                   self.render_engine.fonts[14], (10, 80), 
+                                   engine.sdl2.ext.Color(200, 200, 200))
+        
+        # Continua il loop
+        self.render_engine.new_cycle(60, self.update_display)
+    
+    def run(self):
+        print("Key Tester started. Press keys to see them displayed.")
+        print("Press ESC to quit.")
+        self.render_engine.mainloop(update=self.update_display)
+
+if __name__ == "__main__":
+    tester = KeyTester()
+    tester.run()