Issue #3611624 by noemi.mancini: Add README for the query submodule

Noemi Mancinirequested to merge
issue/search_api_typesense-3611624:3611624-add-readme into 1.0.x

Follow-up to the merged submodule: document what the experimental search_api_typesense_query backend does, when to use it over the InstantSearch pattern, how to configure it, and its limitations.

Closes #3611624

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