Add a method for resetting the game

src/js/Game.js

@@ -57,6 +57,15 @@ export class Game
         this.draw();
     }
 
+    /**
+     * Resets the game.
+     */
+    reset()
+    {
+        this.#state = new State();
+        this.draw();
+    }
+
     /**
      * Replaces the content of the board with the current state.
      */