adding readme for datasets

[August-murr]

What does this PR do?

Fixes #2470

well, that was just not worth it.

Dataset cards can only be added manually so this PR adds a function that modifies it's Readme file and pushes it and I honestly doubt it was worth the complication.

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• Did you write any new necessary tests?

Who can review?

@qgallouedec

[qgallouedec]

Probably simpler:

from huggingface_hub import ModelCard

model_card = ModelCard("""
---
tags: [trl]
---

# Some title

""")

if script_args.push_to_hub:
    model_card.push_to_hub(script_args.repo_id, repo_type="dataset")

[August-murr]

Well, that's one way to overengineer it
I also opened issue on datasets to clarify.
I assume the next step is to add this to all the dataset scripts.

[qgallouedec]

Very good like this

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[August-murr]

it doesn't add all the details requested in the issue #2470 but It's an improvement