Add twig vue js tip

[94noni]

Hello

I think documenting this tip is a good idea when integrating a vue js app inside an existing twig template,
as it can be easier to combine both variables systems

So that twig uses {{ twig_var }}
and vue may use for example ${ vuejs_var }$

---

I do not know if the tip is ok for the doc, and moreover if it is the proper place

Thx

[javiereguiluz]

@Kocal what's your opinion about adding this tip when using Encore and Vue? Thanks!

[Kocal]

Yeah it seems legit to me, it can be useful for beginners I think 👍

[javiereguiluz]

Thanks Antoine!