Add dataset files and model card.

README.md

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+---
+annotations_creators:
+- found
+language_creators:
+- found
+languages:
+- Spanish
+licenses:
+- cc-by-4.0
+multilinguality:
+- monolingual
+pretty_name: readability-es-sentences
+size_categories:
+- unknown
+source_datasets:
+- original
+task_categories:
+- text-classification
+task_ids:
+- text-classification-other-readability
+---
+
+# Dataset Card for [readability-es-sentences]
+
+
+## Dataset Description
+
+Compilation of short Spanish articles for readability assessment.
+
+### Dataset Summary
+
+This dataset is a compilation of short articles from websites dedicated to learn Spanish as a second language. These articles have been compiled from the following sources: 
+- **Coh-Metrix-Esp corpus (Quispesaravia, et al., 2016):** collection of 100 parallel texts with simple and complex variants in Spanish. These texts include children's and adult stories to fulfill each category.
+- **[kwiziq](https://www.kwiziq.com/):** a language learner assistant
+- **[hablacultura.com](https://hablacultura.com/):** Spanish resources for students and teachers. We have downloaded the available content in their websites.
+
+
+### Languages
+
+Spanish
+
+## Dataset Structure
+
+The dataset includes 1019 text entries between 80 and 8714 characters long. The vast majority (97%) are below 4,000 characters long.
+
+### Data Fields
+
+The dataset is formatted as a json lines and includes the following fields:
+- **Category:** when available, this includes the level of this text according to the Common European Framework of Reference for Languages (CEFR).
+- **Level:** standardized readability level: complex or simple. 
+- **Level-3:** standardized readability level: basic, intermediate or advanced
+- **Text:** original text formatted into sentences.
+
+Not all the entries contain usable values for `category`, `level` and `level-3`, but all of them should contain at least one of `level`, `level-3`. When the corresponding information could not be derived, we use the special `"N/A"` value to indicate so.
+
+## Additional Information
+
+### Licensing Information
+
+https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+### Citation Information
+
+Please cite this page to give credit to the authors :)
+
+### Team
+- [Laura Vásquez-Rodríguez](https://lmvasque.github.io/)
+- [Pedro Cuenca](https://twitter.com/pcuenq)
+- [Sergio Morales](https://www.fireblend.com/)
+- [Fernando Alva-Manchego](https://feralvam.github.io/)
+