fix: add the link of paper and code

README.md

@@ -16,6 +16,9 @@ size_categories:
 - 10M<n<100M
 ---
 
+[![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 Market Base Dataset
 
 ## Dataset Description
@@ -72,8 +75,3 @@ This dataset serves as the foundation for PortBench's dual-layer evaluation. It
 
 All features strictly respect temporal integrity — no look-ahead bias. Any derived feature uses only information available at or before the corresponding date.
 
-### Citation
-
-```bibtex
-
-```