Add demo images

README.md

@@ -21,4 +21,9 @@ from hyperlpr import  pipline as  pp
 import cv2
 image = cv2.imread("filename")
 image,res  = pp.SimpleRecognizePlate(image)
-```
+```
+### 测试样例
+
+![image](./cache/demo1.png)
+![image](./cache/demo2.png)
+![image](./cache/demo3.png)