Update README

Author: ZiyiXia

README.md

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-![bge_logo](./imgs/bge_logo.jpg)
+[<img src="./imgs/FlagOpen.png">](https://flagopen.baai.ac.cn/)
 
 <h1 align="center">⚡️BGE: One-Stop Retrieval Toolkit For Search and RAG</h1>
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+![bge_logo](./imgs/bge_logo.jpg)
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 <p align="center">
     <a href="https://huggingface.co/collections/BAAI/bge-66797a74476eb1f085c7446d">
         <img alt="Build" src="https://img.shields.io/badge/BGE_series-🤗-yellow">