Update README.md

README.md

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-license: other
-license_name: cc-by-4.0
-license_link: https://creativecommons.org/licenses/by/4.0/
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+---
+license: other
+license_name: cc-by-4.0
+license_link: https://creativecommons.org/licenses/by/4.0/
+---
+
+Rehosted dataset from [Ready-To-Train AI4Arctic Sea Ice Challenge](https://data.dtu.dk/articles/dataset/Ready-To-Train_AI4Arctic_Sea_Ice_Challenge_Dataset/21316608), to include a common tarball
+with faster download speeds.
+
+If you use this dataset, please cite it with:
+
+Buus-Hinkler, Jørgen; Wulf, Tore; Stokholm, Andreas Rønne; Korosov, Anton; Saldo, Roberto; Pedersen, Leif Toudal; et al. (2022). AI4Arctic Sea Ice Challenge Dataset. Technical University of Denmark. Collection. https://doi.org/10.11583/DTU.c.6244065.v2