[SEO improvement] Add Dataset Metadata to make datasets indexable
{'login': 'cakiki', 'id': 3664563, 'node_id': 'MDQ6VXNlcjM2NjQ1NjM=', 'avatar_url': 'https://avatars.githubusercontent.com/u/3664563?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/cakiki', 'html_url': 'https://github.com/cakiki', 'followers_url': 'https://api.github.com/users/cakiki/followers', 'following_url': 'https://api.github.com/users/cakiki/following{/other_user}', 'gists_url': 'https://api.github.com/users/cakiki/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/cakiki/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/cakiki/subscriptions', 'organizations_url': 'https://api.github.com/users/cakiki/orgs', 'repos_url': 'https://api.github.com/users/cakiki/repos', 'events_url': 'https://api.github.com/users/cakiki/events{/privacy}', 'received_events_url': 'https://api.github.com/users/cakiki/received_events', 'type': 'User', 'site_admin': False}
[{'id': 1935892871, 'node_id': 'MDU6TGFiZWwxOTM1ODkyODcx', 'url': 'https://api.github.com/repos/huggingface/datasets/labels/enhancement', 'name': 'enhancement', 'color': 'a2eeef', 'default': True, 'description': 'New feature or request'}]
[]
Some people who host datasets on github seem to include a table of metadata at the end of their README.md to make the dataset indexable by [Google Dataset Search](https://datasetsearch.research.google.com/) (See [here](https://github.com/google-research/google-research/tree/master/goemotions#dataset-metadata) and [here](https://github.com/cvdfoundation/google-landmark#dataset-metadata)). This could be a useful addition to canonical datasets; perhaps even community datasets.

I'll include a screenshot (as opposed to markdown) as an example so as not to have a github issue indexed as a dataset:

> ![image](https://user-images.githubusercontent.com/3664563/144496173-953428cf-633a-4571-b75b-f099c6b2ed65.png)



**_PS: It might very well be the case that this is already covered by some other markdown magic I'm not aware of._**

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