The folder this file is in should be put in GameData to install the mod.

If you want to get the mod's source code, ask @chitak985 on discord. You can easily find me in the Kopernicus/KSP Modding/Sushut's/Promised Worlds servers or in my server here:
https://discord.gg/qgdEU2X6Xj

The ExampleConfig.cfg should be deleted or moved because it adds a large galaxy at Gilly and should only be used as an example. It does have a bunch of comments to explain how to add the disks though.