update README

Author: qishenonly

README.md

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+<img src="./assets/FlyDB-logo.png" alt="FlyDB-logo" style="display: block; margin: 0 auto; width: 45%;" />
+
+>FlyDB's github address: https://github.com/ByteStorage/FlyDB
+> 
+
+English | [中文](https://github.com/ByteStorage/flydb/FlyDB-SDK-Python/master/README_CN.md)
+
 # FlyDB-SDK-Python
 
 FlyDB-SDK-Python is a software development toolkit (SDK) for interacting with the FlyDB key-value database in Python.

README_CN.md

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+<img src="./assets/FlyDB-logo.png" alt="FlyDB-logo" style="display: block; margin: 0 auto; width: 45%;" />
+
+>FlyDB's github address: https://github.com/ByteStorage/FlyDB
+> 
+
 # FlyDB-SDK-PythonFlyDB-SDK-Python
 
 FlyDB-SDK-Python是用于与FlyDB键值数据库交互的Python软件开发工具包（SDK）。