Update README.md

README.md

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-We are working on a publication, it will be avaliable soon! 
+### Citation
+```bibtex
+@inproceedings{
+gyamfi2026synthetic,
+title={Synthetic Data Generation Pipeline for Low-Resource Swahili Sentiment Analysis: Multi-{LLM} Judging with Human Validation},
+author={Samuel Gyamfi and Alfred Malengo Kondoro and Yank{\i} {\"O}zt{\"u}rk and Richard Hans Schreiber and Vadim Borisov},
+booktitle={7th Workshop on African Natural Language Processing},
+year={2026},
+url={https://openreview.net/forum?id=VQ0VRo4DGM}
+}
+```