Add Vagrantfile for local development

[giner]

This makes it possible to have a VM with all necessities quickly app and running as well as an easy way to have a clean environment at any moment.

[dasormeter]

@giner why don't you raise this is a community-contributed enhancement under
https://docs.dev.sync.global/community/index.html?

Rgds

[giner]

@dasormeter, thank you, I didn't know about the community contributions page. I've given it a thought and I think that having Vagrantfile for cn-quickstart on that page is unlikely to serve the purpose as it'll be hard to spot, inconvenient to use and maintain. If it's in the repo all you do is cloning the repo and running vagrant up. I'm maintaining a similar one for splice: https://github.com/hyperledger-labs/splice/blob/main/Vagrantfile