feat: Add player entity with WASD/space controls and spawn functionality

index.html

@@ -25,6 +25,7 @@
                 <button id="circle-btn">Circle</button>
                 <button id="triangle-btn">Triangle</button>
                 <button id="eraser-btn">Eraser</button>
+                <button id="spawn-player-btn">Spawn Player</button>
             </div>
             <div class="navigation">
                 <button id="move-left">←</button>
@@ -51,6 +52,7 @@
     <script src="js/elements/physics_objects.js"></script>
     <script src="js/entities/entity.js"></script>
     <script src="js/entities/rabbit.js"></script>
+    <script src="js/entities/player.js"></script>
     <script src="js/render.js"></script>
     <script src="js/input.js"></script>
     <script src="js/physics.js"></script>