Adding COVID QA dataset in Chinese and English from UC SanDiego
CONTRIBUTOR
Changed the pre-processing based on the comments raised in [PR-1482](https://github.com/huggingface/datasets/pull/1482).The below command is passing in my local environment:

`python datasets-cli test datasets/covid_qa_ucsd/ --save_infos --all_configs --data_dir ~/Downloads/Medical-Dialogue-Dataset/CovidDailogue/`


2020-12-15T05:05:20Z
https://github.com/huggingface/datasets/pull/1503#issuecomment-745054796
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2020-12-15T09:40:25Z
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