[Feature Request]: Add migration guide from legacy library

[dmohns]

Preflight Checklist

• I have read the Contributing Guidelines for this project, if it exists.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem Description

Currently, it's not really clear how to migration from the legacy library, as this library uses a slightly different abstraction level in terms of Token and values.

Proposed Solution

Add a migration guide.

Alternatives Considered

N/A

Additional Information

No response