theme.txt file describes your theme to Plato. The
theme.txt file is a simple YAML file that contains your theme name, which version of Plato your theme is compatible with and author information.
The theme name is displayed within Plato within the theme selection settings.
You can see below the default
Name: Light Version: 1.0.0 PlatoVersion: 1.0.0 Author: InstantASP WebSite: https://www.instantasp.co.uk/