Update README.md

README.md

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    Advancing <strong>M</strong>ulti-<strong>A</strong>gent <strong>R</strong>easoning <strong>S</strong>ystem via <strong>R</strong>einforcement <strong>L</strong>earning with Agentic Pipeline Parallelism
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-<a href="#" target="_blank">Paper</a> | <a href="https://github.com/liushulinle/MarsRL" target="_blank">GitHub</a>
+<a href="https://github.com/liushulinle/MarsRL/blob/main/MarsRL.pdf" target="_blank">Paper</a> | <a href="https://github.com/liushulinle/MarsRL" target="_blank">GitHub</a>
 </div>
 
 ## Overview