adjust logo size

README-zh.md

-A-Tune介绍
-============
+<img src="misc/A-Tune-logo.png" style="zoom: 30%;" div align=left />
+
 [English](./README.md) | 简体中文
 
-<img src="misc/A-Tune-logo.png" style="zoom: 30%;" />
+## A-Tune介绍
 
 A-Tune是一款基于AI的操作系统性能调优软件。A-Tune利用AI技术，使操作系统“懂”业务，简化IT系统调优工作的同时，让应用程序发挥出色性能。
 

README.md

-Introduction to A-Tune
-============
+<img src="misc/A-Tune-logo.png" style="zoom: 30%;" div align=left />
+
 English | [简体中文](./README-zh.md)
 
-<img src="misc/A-Tune-logo.png" style="zoom: 30%;" />
+## Introduction to A-Tune 
 
 **A-Tune** is an OS tuning software based on AI. A-Tune uses AI technologies to enable the OS to understand services, simplify IT system optimization, and maximize optimal application performance.