Update README.md

README.md

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-license: mit
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+---
+license: mit
+tags:
+- Multimodal Large Language Model (MLLM) 
+- Visual Grounding
+- Reinforcement Fine-tuning
+---
+
+# UniVG-R1 Model Card
+<a href='https://amap-ml.github.io/UniVG-R1-page/'><img src='https://img.shields.io/badge/Project-Page-Green'></a> 
+<a href='https://arxiv.org/abs/2505.14231'><img src='https://img.shields.io/badge/Paper-Arxiv-red'></a>
+
+## Model details
+We propose UniVG-R1, a reasoning-guided MLLM for universal visual grounding, which leverages reinforcement learning to enhance reasoning across complex multi-image and multi-modal scenarios.