gui: Added favicon

src/comp1110/ass2/gui/Game.java

@@ -18,6 +18,7 @@ public class Game extends Application {
         Scene scene = new Scene(this.root, WINDOW_WIDTH, WINDOW_HEIGHT);
         stage.setScene(scene);
         stage.setTitle("Blue Lagoon");
+        stage.getIcons().add(new javafx.scene.image.Image(Game.class.getResourceAsStream("favicon.png")));
         stage.setResizable(false);
         stage.show();
     }