Add React-Admin Postgraphile data-providers in Postgraphile documentation?

What do you think about add in Postgraphile documentation the [React-Admin](https://marmelab.com/react-admin/) [data-providers](https://marmelab.com/react-admin/DataProviders.html#available-providers) for Postgraphile?

I found this projects:

- https://github.com/BowlingX/ra-postgraphile#readme
- https://github.com/lovelysystems/ra-data-postgraphile
- https://github.com/des-des/ra-postgraphile-client

I don't know the maturity of this projets.

Review the PostGraphile documentation and the React-Admin DataProviders page, then inspect the three linked PostGraphile provider projects for maturity and relevance. Done means reaching a supported decision about whether and how these providers should be listed in the documentation.

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