Add magick package

[StevenMaude]

Requested in this Discussions post by @ciaranmci:

My analysis script makes use of an R package called magick. When I run my files locally, an error is thrown saying <there is no package called 'magick'>.
I assume magick hasn't been installed.
Please, can the magick package be installed?

[bloodearnest]

added in #72