Add nq_open question answering dataset 
CONTRIBUTOR
@SBrandeis all checks passing
2020-12-16T14:33:17Z
https://github.com/huggingface/datasets/pull/1587#issuecomment-746385394
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2020-12-16T14:33:17Z
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this is pr is a copy of #1506 due to messed up git history in that pr.