Add something about React events

[nojaf]

One major frustration I had when starting with ReScript was how to get the input value in React. I would hope to add some initial example to might help future newbies. Please don't hesitate to tell me if you want to see things differently. All I care about is that the example makes it.

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[nojaf]

Oh and I did some more tweak to be more upfront about React.array. That one was also less obvious for me.

[fhammerschmidt]

Nice!