Add games/neo-cowsay: Neo Cowsay written in Go

cowsay is a configurable talking ASCII cow (and other characters),
written in Go. It operates much as the figlet program does, and
is written in the same spirit of silliness.

WWW: https://github.com/Code-Hex/Neo-cowsay

PR: 250771
Submitted by: Nuno Teixeira <ed.arrakis@gmail.com>