Add dependencies on Read me for a pure Arch Linux

[erikdubois]

I have made a video about chadwm using Arch Linux and Xfce4 as a base. Archinstall script is used.

https://youtu.be/0VknpDHN2Co

In the video I follow your readme and discovered more dependencies while doing so.

Could you add more apps/dependencies to the readme?

I let you decide which ones.