Create README.md for WER metric
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The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3898). All of your documentation changes will be reflected on that endpoint.
2022-03-11T19:35:07Z
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MEMBER
For ASR you can probably ping @patrickvonplaten 
2022-03-12T09:33:19Z
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CONTRIBUTOR
Ah only noticed now that ` # Values from popular papers` is from a template. @lhoestq @sashavor - not really sure if this section is useful in general really. 

IMO, it's more confusing/misleading than it helps. E.g. a value of 0.03 WER on a fake read-out audio dataset is not better than a WER of 0.3 on a real-world noisy, conversational audio dataset. I think the same holds true for other metrics no? I can think of very little metrics where a metric value is not dataset dependent. E.g. perplexity is super dataset dependent, summarization metrics like ROUGE as well, ...

Also, I don't really see what this section tries to achieve - is the idea here to give the reader some papers that use this metric to better understand in which context it is used? Should we maybe rename the section to `Popular papers making use of this metric` or something? 


2022-03-14T10:34:33Z
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CONTRIBUTOR
I put "Values from popular papers" as a subsection of "Output values" -- I hope that's a compromise that works for everyone :hugs: 
2022-03-14T15:58:18Z
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Proposing a draft WER metric card, @lhoestq I'm not very certain about "Values from popular papers" -- I don't know ASR very well, what do you think of the examples I found?