arxiv dataset added
CONTRIBUTOR
Readme added

2020-12-08T16:06:01Z
https://github.com/huggingface/datasets/pull/1301#issuecomment-740714014
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CONTRIBUTOR
@lhoestq is it looking alright ? 
2020-12-09T17:35:29Z
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**adding arXiv dataset**: arXiv dataset and metadata of 1.7M+ scholarly papers across STEM
dataset link: https://www.kaggle.com/Cornell-University/arxiv