docs: update readme

Author: ChenZiHong-Gavin

README.md

@@ -1,11 +1,16 @@
-# GraphGen: Enhancing Supervised Fine-Tuning for LLMs with Knowledge-Driven Synthetic Data Generation
 
-[English](README.md) | [简体中文](README_zh.md)
+<p align="center">
+  <img src="resources/images/logo.jpg"/>
+</p>
 
 <p align="center">
-  <img src="resources/images/favicon-border.png" width="200" height="200">
+  <a href="README.md">English</a> | <a href="README_zh.md">简体中文</a>
 </p>
 
+
+# GraphGen: Enhancing Supervised Fine-Tuning for LLMs with Knowledge-Driven Synthetic Data Generation
+
+
 ```text
 ├── baselines/           # baseline methods
 ├── cache/               # cache files