Improvements to readme.md file content

[RuoChengF]

As for the README.md file, the code structure directory of the project is not shown in either Chinese or English, which is not very friendly. I hope that a code structure directory can be provided, and then the main role of each file or main file can be marked and so on.
关于README.md 文件中不管是中文还是英文,均没有展示项目的代码结构目录 ,这点不是很友好 , 希望可以提供一个代码结构目录 ,然后可以进行标注每个文件或主要文件的主要作用等等 .

The second requirement is about environmental dependence, which is not reflected in the README.md file, so it is not very friendly and I hope it can be improved

第二点的需求是关于 环境依赖这部分在README.md 文件中也没有体现,不是很友好希望可以改进