add React samples for different frameworks

[jkone27]

How to add a "Hello react" app, both in Fable and in Feliz,
reason is React is the most used web framework atm in the industry.

think it's most idiomatic for React users,

as Feliz very much resembles HTML/jsx...

[MangelMaxime]

We need to find how to add back libraries support to the REPL.

This is something that has been lost since REPL for Fable 3, and I think this is still not available. Without, this it is not possible to add examples that requires libraries like Feliz, Elmish, etc.