Add ansimotd
Add ansimotd

https://github.com/yuhonas/zsh-ansimotd/issues/1 is closed, add `ansimotd` plugin

Signed-off-by: Joe Block <13bb081c6ac072ef78a3e348068e2204400d7335@unixorn.net>

unixorn/awesome-zsh-plugins,voronkovich/awesome-zsh-plugins