doc update for hgq/da

Author: calad0i

README.md

@@ -125,6 +125,18 @@ Additionally, if you use specific features developed in later papers, please cit
     year = "2022"
 }
 ```
+Distributed arithmetic:
+```bibtex
+@misc{Sun:2025,
+      title={da4ml: Distributed Arithmetic for Real-time Neural Networks on FPGAs},
+      author={Chang Sun and others},
+      year={2025},
+      eprint={2507.04535},
+      archivePrefix={arXiv},
+      primaryClass={cs.AR},
+      url={https://arxiv.org/abs/2507.04535},
+}
+```
 binary/ternary networks:
 ```bibtex
 @article{Loncar:2020hqp,