day3，解决ResourceImageRead无法加载报错，将图片加入resource文件夹

tankWar/src/test/ImageTest.java

@@ -3,7 +3,6 @@ package test;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.awt.image.BufferedImage;
-import java.io.File;
 import java.io.IOException;
 
 import javax.imageio.ImageIO;