Add FashionMNIST dataset
CONTRIBUTOR
Hi @lhoestq,

I have added the changes from the review.
2021-03-08T18:42:51Z
https://github.com/huggingface/datasets/pull/1999#issuecomment-792983667
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2021-03-08T18:42:51Z
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This PR adds [FashionMNIST](https://github.com/zalandoresearch/fashion-mnist) dataset.