Update README-cn.md

Author: aidlearning

README-cn.md

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 <p align="center">
-  <img src="https://cdn.nlark.com/yuque/0/2020/png/726405/1578322228096-7dba507c-67f2-463b-a280-791bebed0418.png?x-oss-process=image%2Fresize%2Cw_1492" height="75" width="400">
+  <img src="https://cdn.nlark.com/yuque/0/2020/png/726405/1578322228096-7dba507c-67f2-463b-a280-791bebed0418.png?x-oss-process=image%2Fresize%2Cw_1492"  width="900">
   <br>
   Linux, AI, Python, GUI: 4-in-1 Environments Running on Android. [中文版] <a href='README.md'>[English]</a>
 </p>