Add `useReducer` hook with types example

[piotrwitek]

Add example of typing:
https://reactjs.org/docs/hooks-reference.html#usereducer

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[sosukesuzuki]

@piotrwitek
I want to try to this issue. Where should I add the example?

[piotrwitek]

Ok cool!
Put it under Component Typing Patterns => Hooks => useReducer

Make sure to read contribution guide and fully understand it.

Put components in the playground and reference them in the markdown files.

[sosukesuzuki]

I got it !
I'll crate the PR:+1:

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