Add the GitHub repository and citation sections

README.md

@@ -52,3 +52,23 @@ in proportion to its size. It is the split every experiment in
 The instruction appended to every question:
 
 > Solve the problem and give the final numerical answer, in the unit stated in the question, inside \boxed{}.
+
+## GitHub repository
+
+The full code of CRE-Router is at [github.com/ymoslem/CRE-Router](https://github.com/ymoslem/CRE-Router).
+
+## Citation
+
+If you use CRE-Router or any of its artifacts, please cite the following paper:
+
+```bibtex
+@article{moslem2026clusterrouteescalate,
+      title={Cluster, Route, Escalate: Cascaded Framework for Cost-Aware LLM Serving},
+      author={Yasmin Moslem and Magdalena Kacmajor and Vasudevan Nedumpozhimana and Ammar Abbas and Solmaz Panahi and David Lynch and Zhuangzhuang Nie and Alexandros Agapitos and Aleksandar Milenovic and Hongmeng Song and Yucheng Shi and Yue Pan and Patricia Buffini and John D. Kelleher},
+      year={2026},
+      eprint={2606.27457},
+      archivePrefix={arXiv},
+      primaryClass={cs.PF},
+      url={https://arxiv.org/abs/2606.27457},
+}
+```