Update README.md

README.md

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 ```
 
+## Citation
+i
+```
+The model used for fine-tuning is the SGPT model, which was created by Niklas Muennighoff [1]. SGPT is a GPT-based model that is specifically designed for semantic search tasks. The preprint
+for the SGPT model can be accessed at [2].
+
+[1] Muennighoff, N. (2022). SGPT: GPT Sentence Embeddings for Semantic Search. arXiv preprint arXiv:2202.08904.
+
+[2] Link to the preprint: https://arxiv.org/abs/2202.08904```