Because sometimes the default Times New Roman just won't do for your CTScript project.
An example files:
Find the font you'd like to use
Look around on https://fonts.google.com/ as it has a nice showcase. For this example I selected Roboto
Download TTF and EOT file
You can find the TTF and EOT files you will need on https://google-webfonts-helper.herokuapp.com/fonts
Add the files to CTScript under resources
Add the CSS file to the screens
You drag and drop the CSS file on the screens you would like to use.
Enjoy your new font