update README.md

README.md

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 # TBAC-VLR1-3B-preview
 
+## Overview
+This is a multimodal language model fine-tuned by Tencent PCG Basic Algorithm Center. Based on Qwen2.5-VL-3B-Instruct, TBAC-VLR1-3B-preview uses Group Relative Policy Optimization
+(GRPO) to enhance multimodal reasoning ability, achieving state-of-the-art results on several multimodal reasoning benchmarks among models of the same size.
+
 ## Performance
 | Model                     | **Average** | **MathVista**| **MathVision** | **MathVerse** | **DynaMath**  | **WeMath**| **LogicVista** |
 | :-------------------:     | :---------: | :-----------:| :------------: | :-----------: | :-----------: | :-------: | :----------:   |