Update README(add A-PNG)

Author: whyb

README.md

@@ -79,6 +79,4 @@ Use this method if you have cloned the project source code from GitHub and want
 
 ## Demo
 Here are some possible results from a local test run:
-![decoder test result](https://raw.githubusercontent.com/whyb/HwCodecDetect/main/imgs/decoder.png)
-
-![encoder test result](https://raw.githubusercontent.com/whyb/HwCodecDetect/main/imgs/encoder.png)
+![test result](https://raw.githubusercontent.com/whyb/HwCodecDetect/main/imgs/run_tests.png)

README.zh.md

@@ -72,7 +72,4 @@
 
 ## 效果展示
 下面是本地运行测试的可能的结果：
-
-![decoder test result](https://raw.githubusercontent.com/whyb/HwCodecDetect/main/imgs/decoder.png)
-
-![encoder test result](https://raw.githubusercontent.com/whyb/HwCodecDetect/main/imgs/encoder.png)
+![test result](https://raw.githubusercontent.com/whyb/HwCodecDetect/main/imgs/run_tests.png)