chore: adding license

[georgewrmarshall]

Description

This pull request adds a dual-license (MIT OR Apache 2.0) to the design-tokens repository to align with MetaMask’s open-source licensing standards. This change allows external users to fork and utilize the design-tokens package without legal conflicts, adhering to MetaMask’s recommended open-source practices.

Following guidance from our legal team, this PR includes both LICENSE-MIT and LICENSE-APACHE files and updates the package.json to specify the dual-license format.

Related Issues

Fixes: #737

Manual Testing Steps

1. Confirm that the LICENSE-MIT and LICENSE-APACHE files are present in the repository root.
2. Verify that package.json contains "license": "(MIT OR Apache-2.0)".
3. Cross-check that the licensing terms match MetaMask’s open-source standards.

Pre-merge Author Checklist

• Reviewed MetaMask Coding Standards for open-source licensing.
• Included relevant license files in the root directory.
• Verified that the package.json license entry follows the specified format.

Pre-merge Reviewer Checklist

• Confirmed that the included license files ensure compliance with MetaMask’s open-source guidelines.
• Checked that the package.json entry reflects the correct license terms.
• Verified that all legal and compliance requirements are met.

References

• Slack Thread
• Auto-changelog repository license setup example

[georgewrmarshall]

I realize the storybook job is failing created an issue here #740