Update readme-cn.md

Author: aidlearning

readme-cn.md

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 <img src="https://img.shields.io/github/forks/aidlearning/AidLearning-FrameWork?style=flat" alt="Fork">
 <img src="https://img.shields.io/github/stars/aidlearning/AidLearning-FrameWork?style=flat" alt="star">
 <img src="https://img.shields.io/github/last-commit/aidlearning/AidLearning-FrameWork?style=plastic" alt="commit">
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 [English Version](README.md)
 
 ## 简介