added collisions

src/main.cpp

@@ -95,7 +95,7 @@ int main() {
 		player.set_velocity_y(player.get_velocity().y + player.m_acceleration);
 		player.rect.move({0, player.get_velocity().y});
 
-		test_square.set_velocity_y(player.get_velocity().y + 1);
+		test_square.set_velocity_y(test_square.get_velocity().y + 1);
 		if(test_square.get_velocity().x > 0) {
 			test_square.set_velocity_x(test_square.get_velocity().x - 1);
 		}