Contacts completion

[soywod]

[soywod]

I develop a command-line interface called Cardamom to manage and synchronize contacts from a CardDAV server. It follows the same philosophy as Himalaya, and it will be a Rust lib as well for a better integration with Himalaya.

[jasonccox]

I was playing around with this yesterday and implemented basic contact completion (assuming users have a command to search their contacts) in the Vim plugin: #250 Let me know what you think!