Update leaderboard link in README.md

Author: XuanL17

README.md

@@ -3,7 +3,7 @@
 
   <h1>HumanStudy-Bench: Towards AI Agent Design for Participant Simulation</h1>
 
-  <h3><a href="#">📊 See Leaderboard & Results</a> | <a href="https://arxiv.org/abs/2602.00685">📖 Read the Paper</a></h3>
+  <h3><a href="https://humanstudybench.vercel.app">📊 See Leaderboard & Results</a> | <a href="https://arxiv.org/abs/2602.00685">📖 Read the Paper</a></h3>
 
   [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
   [![Python 3.8+](https://img.shields.io/badge/python-3.8+-blue.svg)](https://www.python.org/downloads/)