Docs on how to use vue-router with vue 2.7 composition api

[mika76]

What problem does this feature solve?

I can't find anywhere info on how to use vue-router properly with the vue 2 version of composition api (especially now that 2.7 is out and people want to migrate slowly over). Which version of vue-router do I use - if I use 4.x the there is an unmet dependency on vue 3 - if I use 3.x then there are no composition api functions to use...

I know this might not be possible - but at the moment there is no info one way or the other, so really I'd just appreciate some clarification and suggest that maybe a comment in the docs would be helpful.

What does the proposed API look like?

Add some docs

[posva]

Duplicate of #3760

[posva]

Please, search existing issues and pull requests before opening issues, it saves maintainers a lot of time 🙏