Add cord 19 dataset
CONTRIBUTOR
Cleaned-up version of previous PR: https://github.com/huggingface/datasets/pull/1129
2021-02-09T10:23:00Z
https://github.com/huggingface/datasets/pull/1850#issuecomment-775831999
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CONTRIBUTOR
@lhoestq FYI
2021-02-09T10:34:48Z
https://github.com/huggingface/datasets/pull/1850#issuecomment-775840150
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MEMBER
Before merging I might tweak a little bit the dummy data to avoid having to check if the `document_parses` and `embeddings` directories exist or not. I'll do that later today
2021-02-09T11:48:52Z
https://github.com/huggingface/datasets/pull/1850#issuecomment-775881754
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Looks all good now ! Thanks a lot @ggdupont :)
Merging
2021-02-09T15:16:12Z
https://github.com/huggingface/datasets/pull/1850#issuecomment-776014687
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Initial version only reading the metadata in CSV.

### Checklist:
- [x] Create the dataset script /datasets/my_dataset/my_dataset.py using the template
- [x] Fill the _DESCRIPTION and _CITATION variables
- [x] Implement _infos(), _split_generators() and _generate_examples()
- [x] Make sure that the BUILDER_CONFIGS class attribute is filled with the different configurations of the dataset and that the BUILDER_CONFIG_CLASS is specified if there is a custom config class.
- [x] Generate the metadata file dataset_infos.json for all configurations
- [x] Generate the dummy data dummy_data.zip files to have the dataset script tested and that they don't weigh too much (<50KB)
- [x] Add the dataset card README.md using the template and at least fill the tags
- [x] Both tests for the real data and the dummy data pass.

### Extras:
- [x] add more metadata
- [x] add full text
- [x] add pre-computed document embedding