add wikisql
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That's great work @ghomasHudson !
2020-06-25T09:17:38Z
https://github.com/huggingface/datasets/pull/310#issuecomment-649413914
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2020-06-25T09:17:38Z
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Adding the [WikiSQL](https://github.com/salesforce/WikiSQL) dataset.

Interesting things to note:
- Have copied the function (`_convert_to_human_readable`) which converts the SQL query to a human-readable (string) format as this is what most people will want when actually using this dataset for NLP applications.
- `conds` was originally a tuple but is converted to a dictionary to support differing types.

Would be nice to add the logical_form metrics too at some point.