Add readme

Readme.md

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+---
+language:
+- pl
+library_name: transformers
+---
+
+This dataset contains questions and passages from Polish law. 
+
+The dataset was created by randomly searching for provisions and asking questions related to that provision, in the
+style of SQuAD. As a result, the questions might be biassed towards the content of a specific provision.
+
+
+The authors of this dataset are student from AGH University of Krakow, supervised by [Aleksander
+Smywiński-Pohl](https://huggingface.co/apohllo), PhD.
+
+If you use the dataset, please cite the following article:
+
+```
+@article{kobylinski2023poleval,
+  title={PolEval 2022/23 Challenge Tasks and Results},
+  author={Kobylinski, {\L}ukasz and Ogrodniczuk, Maciej and Rybak, Piotr and Przyby{\l}a, Piotr and Pezik, Piotr and Miko{\l}ajczyk, Agnieszka and Janowski, Wojciech and Marcinczuk, Micha{\l} and Smywinski-Pohl, Aleksander},
+  year={2023},
+  journal={Proceedings of the 18th Conference on Computer Science and Intelligence Systems},
+  pages={1243–1250}
+}
+```