This is a plugin for Godot Engine that was made to use with [WPGTK](https://github.com/deviantfero/wpgtk) package available for Linux to change the editors color scheme.
Technically speaking, it is a plugin that listens to the 'config/wpgtk-colors.txt' configuration file and updates the editor's theme accordingly, so in theory any application that can change the contents of that file will also work, but the installation guide here is only for setting it up with WPGTK.
3. Copy the contents of `addons/config/wpgtk-colots.base` to the newly created base file in your WPGTK config templates folder (This is usually `~/.config/wpg/templates`).