add citation to README

README.md

@@ -78,3 +78,17 @@ For simple smoke tests, the following will
         make models
         make test
     
+## How to cite
+If you find this tool useful in your work, please consider citing our paper:
+
+```bibtex
+@inproceedings{hip23rezanezhad2,
+author    = {Vahid Rezanezhad and Konstantin Baierer and Clemens Neudecker},
+editor    = {Apostolos Antonacopoulos and Christian Clausner and Maud Ehrmann and Kai Labusch and Clemens Neudecker},
+title     = {A hybrid CNN-Transformer Model for Historical Document Image Binarization},
+booktitle = {Proceedings of the 7th International Workshop on Historical Document Imaging and Processing {HIP} 2023, 
+             San José, CA, USA, August 26, 2023},
+year      = {2023},
+url       = {https://doi.org/10.1145/3604951.3605508}
+}
+```