Add model card

This PR adds metadata to the model card, including the license, library name and pipeline tag. It also adds a citation.

README.md

@@ -1,4 +1,8 @@
-
+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: image-to-text
+---
 
 <div align="center">
 <h1> OmniCaptioner: One Captioner to Rule Them All </h1>
@@ -76,8 +80,15 @@ CUDA_VISIBLE_DEVICES=0,1,2,3  nohup python run.py --data MMMU_DEV_VAL --model Om
 ## Citation
 
 If you find the provided code or models useful for your research, consider citing them as:
-```
-
-```
-
-
+```bibtex
+@misc{,
+  title={OmniCaptioner: One Captioner to Rule Them All}, 
+  author={Anonymous Authors},
+  year={2024},
+  eprint={2504.07089},
+  archivePrefix={arXiv},
+  primaryClass={cs.CV},
+  url={https://arxiv.org/abs/2504.07089}
+}
+
+```