Update README.md

Add medRxiv preprint citation and DOI metadata

README.md

@@ -199,6 +199,22 @@ This model repository was generated by [ML Intern](https://github.com/huggingfac
 - Try ML Intern: https://smolagents-ml-intern.hf.space
 - Source code: https://github.com/huggingface/ml-intern
 
+## Preprint Citation
+
+If you use this model or the accompanying findings in your research, please cite our preprint:
+
+```bibtex
+@article{thomas2026agentic,
+  author    = {Thomas, Johnson and others},
+  title     = {Agentic Thyroid Model Paper Title},
+  journal   = {medRxiv},
+  year      = {2026},
+  doi       = {10.64898/2026.06.23.26356395v1},
+  url       = {https://www.medrxiv.org/content/10.64898/2026.06.23.26356395v1}
+}
+```
+
+
 ## Usage
 
 ```python