Update README.md with dataset description and citation

README.md

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 license: cc-by-4.0
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+
+## About this dataset
+The [CAES](http://galvan.usc.es/caes/) [(Parodi, 2015)](https://www.tandfonline.com/doi/full/10.1080/23247797.2015.1084685?cookieSet=1) dataset, also referred as the “Corpus de Aprendices del Español” (CAES), is a collection of texts created by Spanish L2 learners from Spanish learning centres and universities. These students had different learning levels, different backgrounds (11 native languages) and various levels of experience with the language. We used web scraping techniques to download a portion of the full dataset since its current website only provides content filtered by categories that have to be manually selected. The readability level of each text in CAES follows the [Common European Framework of Reference for Languages (CEFR)](https://www.coe.int/en/web/common-european-framework-reference-languages). The raw version of this corpus also contains information about the learners and the type of assignments with which they were assigned to create each text.
+
+We have downloaded this dataset from its original [website](https://galvan.usc.es/caes/search) to make it available to the community. If you use this data, please credit the original author and our work as well.
+
+## Citation 
+
+If you use our splits in your research, please cite our work: "[A Benchmark for Neural Readability Assessment of Texts in Spanish](https://drive.google.com/file/d/1KdwvqrjX8MWYRDGBKeHmiR1NCzDcVizo/view?usp=share_link)"
+
+```
+@inproceedings{vasquez-rodriguez-etal-2022-benchmarking,
+    title = "The Role of Text Simplification Operations in Evaluation",
+    author = "V{\'a}squez-Rodr{\'\i}guez, Laura  and
+      Cuenca-Jim{\'\e}nez, Pedro-Manuel and
+      Morales-Esquivel, Sergio Esteban and
+      Alva-Manchego, Fernando",
+    booktitle = "Workshop on Text Simplification, Accessibility, and Readability (TSAR-2022), EMNLP 2022",
+    month = dec,
+    year = "2022",
+}
+```