Add README and LICENSE Files

[UnitedPenguin]

This pull request introduces a detailed README.md that provides an overview of the Nothirium mod, its requirements, incompatibilities, and additional notes. It also incorporates the Apache License 2.0 as the project's license in the LICENSE file. The addition of these files aims to enhance the project's clarity and inform users and contributors about the mod's functionalities and legal permissions.

[Meldexun]

Why do you think that I want to use the Apache License 2.0?