fix: add the link of paper and code

README.md

@@ -16,6 +16,9 @@ size_categories:
 - 1M<n<10M
 ---
 
+[![Paper](https://img.shields.io/badge/arXiv-2605.27887-b31b1b)](https://arxiv.org/abs/2605.27887)
+[![Code](https://img.shields.io/badge/GitHub-PortBench-blue)](https://github.com/AgenticFinLab/portbench)
+
 # PortBench QA Dataset
 
 ## Dataset Description
@@ -98,9 +101,3 @@ QA pairs are stratified by market regime (bull/bear/sideways/crisis) to enable p
 ### Point-in-Time (PiT) Constraint
 
 All questions use only information available at or before the `decision_date`. Ground-truth answers are computed from realized future data that is never included in the question or context.
-
-### Citation
-
-```bibtex
-
-```