install terminus on mac code example

Example: install terminus in ubuntu

## Here are simple commands for ubuntu
sudo apt install gdebi
wget https://github.com/Eugeny/terminus/releases/download/v1.0.0-alpha.18/terminus_1.0.0-alpha.18_amd64.deb
sudo gdebi terminus_1.0.0-alpha.18_amd64.deb

# Now Type terminus on terminal to open it.
terminus  ## Now press Enter.