update: readme

Author: sairin1202

README.md

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 ![MemU Banner](assets/banner.png)
 
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 [![Twitter](https://img.shields.io/badge/Twitter-Follow-1DA1F2?logo=x&logoColor=white)](https://x.com/Nevamind_ai)
 [![Reddit](https://img.shields.io/badge/Reddit-Join%20Community-FF4500?logo=reddit&logoColor=white)](https://reddit.com/r/MemU)
 [![WeChat](https://img.shields.io/badge/WeChat-微信群-07C160?logo=wechat&logoColor=white)](#)
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 **MemU** is an open-source memory framework for AI companions—high accuracy, fast retrieval, low cost. It acts as an intelligent "memory folder" that adapts to different scenarios, from different companions senarios.
 
 With **memU**, you can build AI companions that truly remember you. They learn who you are, what you care about, and grow alongside you through every interaction.
 
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