Suggestion: Add human-readable output to `neil dep add`

[rads]

Description:
When you add a dependency you have to check the deps.edn file after to see what version was added. It would be convenient to see this in the output of the neil dep add command.

Current behavior:

$ neil dep add com.nextjournal/beholder
# no output

Suggested behavior:

$ neil dep add com.nextjournal/beholder
Added to deps.edn: [com.nextjournal/beholder {:mvn/version "1.0.2"}]

[borkdude]

Currently all commands output lines of EDN that potententially can be fed into neil as arguments, so it would be more in line to return something like:

:lib com.nextjournal/beholder :version "1.0.2" :added true

or whatever