Vue typescript support

[Phelix]

This is a follow up for issue #64. I'm opening a new one because typescript support is only support for @heroicons/react and not @heroicons/vue. I feel it would be nice to add the type definition for @heroicons/vue

[Raquis]

Hope this one is noticed ASAP

[Vincent Prat]

I may have missed it in the docs, but how do we do it in practice?