Please add a LICENSE file

[attogram]

This repo does not have a LICENSE file.

Please add one, thanks! The MIT notice in the README.md is good, but more clarity is better:

https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository

[steinmb]

How to reproduce if that is unclear:

composer validate

./composer.json is valid, but with a few warnings
See https://getcomposer.org/doc/04-schema.md for details on the schema
# General warnings
- No license specified, it is recommended to do so. For closed-source software you may use "proprietary" as license.