Add example on recursive components

[cem2ran]

I've seen this be asked a handful of times and think it deserves to be in the documentation.

Most recently this was posted on discord (react channel)

[cem2ran]

related: #330

[GTDev87]

I don't know a way of mutually recursive components, but I found this example here:

https://reasonml.chat/t/how-to-create-recursive-component-in-reasonreact/514/6

This is the best example I've found so far. Even though it would be nicer if it were possible to spilt into multiple files.

Just leaving here for people to find.

[manishkumar123456]

in which i hav to add example on recursive components please tell me