Add docs for react-hooks-testing-library

[alexkrolick]

testing-library/react-testing-library#274

[alexkrolick]

@donavon any interest in porting the examples over here?

[alexkrolick]

This should be updated to use the external library now https://github.com/mpeyper/react-hooks-testing-library

[bcarroll22]

Let me look at this, I'll see how much modification it would be to port the docs from native to here.

What section would you want it in? Ecosystem? I created a "Hook Examples" section in the recipes sidebar on native's docs (see here), but I added renderHook to the API section since we export it directly, so that wouldn't work.

[alexkrolick]

@bcarroll22 #64 I think I left feedback on this one that should be enough to get this done

I think we want an ecosystem link for the lib and then a Recipe for both a custom hook and a component implemented using hooks (to illustrate there are no differences between that and a class component in terms of tests)

@donavon may also have some feedback since he uses hooks testing library a lot

[alexkrolick]

TODO: finish this 😄

[rawat07102]

Hey! I want to work on this, so I should make 2 different PR, one for ecosystem link and one for Recipe, right?

[alexkrolick]

@rawat07102 either way. Please take a look at #64 and work off that.