add paper link

README.md

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+
+## Citation
+If you are using the model in your research, please cite the following 
+[paper](https://doi.org/10.1007/978-3-031-35320-8_4) where it was introduced:
+```
+@InProceedings{10.1007/978-3-031-35320-8_4,
+  author="Babakov, Nikolay
+  and Dale, David
+  and Gusev, Ilya
+  and Krotova, Irina
+  and Panchenko, Alexander",
+  editor="M{\'e}tais, Elisabeth
+  and Meziane, Farid
+  and Sugumaran, Vijayan
+  and Manning, Warren
+  and Reiff-Marganiec, Stephan",
+  title="Don't Lose the Message While Paraphrasing: A Study on Content Preserving Style Transfer",
+  booktitle="Natural Language Processing and Information Systems",
+  year="2023",
+  publisher="Springer Nature Switzerland",
+  address="Cham",
+  pages="47--61",
+  isbn="978-3-031-35320-8"
+}
+```