update README

Author: WCJ-BERT

README.md

@@ -2,6 +2,7 @@
 <img src="docs/imgs/WE_title.png" width="800px">
 
 # Towards the Era of Post-Training for Physical AI
+> *The missing infrastructure for Physical AI post-training in AD. Open-source. Production-validated.*
 
 [![Paper](https://img.shields.io/badge/Paper-Coming_Soon-b31b1b.svg?style=for-the-badge&logo=arxiv)](https://github.com/OpenDriveLab/WorldEngine)
 [![Hugging Face](https://img.shields.io/badge/Hugging_Face-Dataset-ffc107.svg?style=for-the-badge&logo=huggingface)](https://huggingface.co/datasets/OpenDriveLab/WorldEngine)