Examples/using unstated

[greglobinski]

This is an example of usage - unstated as a central state container.

I tried to ask if such a code is welcome as PR #6840

If you do not want to fatten the examples folder just close this request.

[KyleAMathews]

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[pieh]

Hey, let's try to not multiplicate very similiar examples.
How about instead of adding example, we add guide / recipe to the docs that show how to setup any package that uses Provider (so this can be redux, unstated or even "new" React context)?

Also side note - replaceRouterComponent API will probably be removed when we switch from react-router to @reach/router ( #6918 ). It also doesn't make sense to use that API to add providers - it feels this is needed right now because it injects components in appropiate place in component tree right now? If any of other existing APIs doesn't allow to do that (potentially wrapRootComponent could be good candidate?) we should add such an API

[pieh]

As follow up to my previous comment - using wrapRootComponent is viable replacement for replaceRouterComponent in "Provider" usecases - see #6986

[greglobinski]

Ok. Thank you.