[PATCH] tevent: add another example

[Ralph Böhme]

Hi Metze,

appreciate your review!

Updated patchset incorporating your changes coming along in a minute.

I have refrained from adopting your idea of using a mul_add_next()
function, because from my pov as a tevent learner, this adds a
introduces an idiom mentioned nowhere in the sparse documentation.

And that's what I was trying to achieve: write the simplest possible
use case sticking to basic functions and
xxx_send()/xxx_done()/xxx_recv() idiom.

-Ralph

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