add AUR helpers

[pvinis]

it would be cool to have a section to install AUR helpers, like where you choose text editors, games etc.

I use pacaur very much and pm before it.

[faddat]

I'm more if a yaourt guy and would love having all three. Let me know if I can assist with anything, freaking love arch anywhere.

[deadhead420]

added in the next release

[jonocodes]

I installed anywhere 2.2.5 today and it did not install yaourt.

I would like access provided to the AUR, but please provide instructions how to get it.
Perhaps in the readme? Or as an install option like Antergos does it?

I see it in your repo online, but I had to install it manually.

Thanks.