Gobrew examples

To run an example, use go run, eg.

$ go run examples/list.go
aws-console (1.8.5)
awscli (2.15.39)
bandwhich (0.22.2)
bat (0.24.0)
...
zoxide (0.9.4)
zsh-autosuggestions (0.7.0)
zstd (1.5.6)
zx (8.0.2)
Total packages: 189
$

from the project's root.