Smaller version of Neofetch.
Mark install.sh as executable and run it to install. (sudo ./install.sh)
To edit the layout (kinda hard, needs basic bash knowledge), open /usr/bin/minifetch and edit the "$main=(...)" part.
To use Rainbow Text, Install "lolcat".
Ubuntu/Debian: sudo apt install lolcat
ArchLinux: sudo pacman -S lolcat