Add Wikisource dataset
MEMBER
As we are removing the dataset scripts from GitHub and moving them to the Hugging Face Hub, I am going to transfer this script to the repo: https://huggingface.co/datasets/wikimedia/wikisource
2022-09-30T13:56:10Z
https://github.com/huggingface/datasets/pull/3418#issuecomment-1263609724
https://api.github.com/repos/huggingface/datasets/issues/3418
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2022-09-30T13:56:10Z
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Add loading script for Wikisource dataset.

Fix #3399.

CC: @geohci, @yjernite