Add pipeline tag and link to paper

This PR improves the model card metadata by adding the `image-text-to-text` pipeline tag, which ensures the model is correctly categorized on the Hugging Face Hub. It also adds explicit links to the paper, code repository, and project page for better accessibility.

README.md

@@ -1,6 +1,7 @@
 ---
-license: apache-2.0
 library_name: transformers
+license: apache-2.0
+pipeline_tag: image-text-to-text
 tags:
 - vision-language-model
 - spatial-reasoning
@@ -11,6 +12,8 @@ tags:
 
 This repository hosts the released checkpoints for **GeoSR: Make Geometry Matter for Spatial Reasoning**.
 
+[**Paper**](https://arxiv.org/abs/2603.26639) | [**Project Page**](https://suhzhang.github.io/GeoSR/) | [**Code**](https://github.com/SuhZhang/GeoSR)
+
 ## Checkpoints
 
 | Folder | Branch / task | Notes |
@@ -65,6 +68,10 @@ Please refer to the main code repository for full training and evaluation instru
 @misc{zhang2026geosr,
   title={Make Geometry Matter for Spatial Reasoning},
   author={Shihua Zhang and Qiuhong Shen and Shizun Wang and Tianbo Pan and Xinchao Wang},
-  year={2026}
+  year={2026},
+  eprint={2603.26639},
+  archivePrefix={arXiv},
+  primaryClass={cs.CV},
+  url={https://arxiv.org/abs/2603.26639}
 }
-```
+```