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README.md

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-license: cc-by-nc-sa-4.0
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+---
+license: cc-by-nc-sa-4.0
+language:
+- cy
+---
+
+This dataset has been indexed in the UniversalCEFR. The transformed version (in JSON format) retains the same license as the original dataset. Ownership and copyright remain with the original creators and/or dataset paper authors. If you use this transformed dataset, you must cite the following:
+
+Dataset License: cc-by-nc-sa-4.0
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+Dataset Repository: https://learnwelsh.cymru/learning/resource-library/?k=Coursebooks&opt=Tags
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+Original Dataset Paper: UniversalCEFR