Add LICENSE Comments

[joe-bell]

Description

While I'm totally flattered by (and continue to encourage!) the number of projects extending cva and class-variance-authority, it's important to call out that this project is–and always has been–Apache 2.0 licensed

Personally, I've always preferred Apache 2.0 for cultivating a stronger culture of attribution within open-source

With Apache 2.0 comes specific obligations:

1. You must release all the unmodified parts of the software under the same license (the Apache License)
2. You must include copyright and attribution notices, disclaiming warranties, and provide a copy of the license with any distribution of the software.

Source

Hoping that these comments and an extra layer of clarity 🙏

Additional context

Recently spotted react-spectrum using these comment blocks, and thought it would be a nice idea to implement too!

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What is the purpose of this pull request?

• [ ] Bug fix
• [ ] New Feature
• [x] Documentation update
• [ ] Other

Before submitting the PR, please make sure you do the following

• [x] Read the Contributing Guidelines.
• [x] Follow the Style Guide.
• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).

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