Add license to project

[solonovamax]

Describe the bug

Currently, the project has no LICENSE file. although the modrinth page does list it as being GPL, it is good practice to create a license file.

Log Files

N/A

Mod Version, Modloader, and Minecraft Version

• Which version of the mod are you using?
  N/A

• Fabric, Forge, NeoForge?
  N/A

• Which Minecraft version?
  N/A