doc(README): add feature image

README.md

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+<div align="center">
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 # free-one-api
 
 [中文文档](README_cn.md) | [English](README.md)
 
+[![GitHub release (latest by date)](https://img.shields.io/github/v/release/RockChinQ/free-one-api)](https://github.com/RockChinQ/free-one-api/releases/latest)
+<a href="https://hub.docker.com/repository/docker/rockchin/free-one-api">
+    <img src="https://img.shields.io/docker/pulls/rockchin/free-one-api?color=blue" alt="docker pull">
+  </a>
+![Wakapi Count](https://wakapi.dev/api/badge/RockChinQ/interval:any/project:free-one-api)
+
+<img width="500" alt="image" src="assets/feature.png">
+
+</div>
+<hr>
+
 Turn reverse engineered LLM lib to standard OpenAI GPT API.  
 By using free-one-api, you can easily convert reverse engineered LLM libs (e.g. [acheong08/ChatGPT](https://github.com/acheong08/ChatGPT) ) to standard OpenAI GPT API.  
 So other application supports OpenAI GPT API can use reverse engineered LLM libs directly.

README_cn.md

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+<div align="center">
+
 # free-one-api
 
 [中文文档](README_cn.md) | [English](README.md)
 
+[![GitHub release (latest by date)](https://img.shields.io/github/v/release/RockChinQ/free-one-api)](https://github.com/RockChinQ/free-one-api/releases/latest)
+<a href="https://hub.docker.com/repository/docker/rockchin/free-one-api">
+    <img src="https://img.shields.io/docker/pulls/rockchin/free-one-api?color=blue" alt="docker pull">
+  </a>
+![Wakapi Count](https://wakapi.dev/api/badge/RockChinQ/interval:any/project:free-one-api)
+
+<img width="500" alt="image" src="assets/feature.png">
+
+</div>
+<hr>
+
 将逆向工程的大语言模型库转换为标准的 OpenAI GPT API。  
 通过使用 free-one-api，您可以轻松地将逆向工程的 LLM 库（例如 [acheong08/ChatGPT](https://github.com/acheong08/ChatGPT) ） 转换为标准的 OpenAI GPT API。  
 因此，其他支持 OpenAI GPT API 的应用程序可以直接使用逆向工程的 LLM 库。