Document (module page & README.md) which URL parameters are supported, e.g. page, filter, ...

Problem/Motivation

Hi and thank you VERY much for this impressively helpful module!

I was just struggling to find out which URL parameters rest_views supports.
In my example I need pages and eventually offset, but it would be nice if all supported url parameters could be documented.

https://www.drupal.org/project/jsonapi_views shows that information on the module page for example.

Thanks!

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