update README

[uchidayuma]

Description

Fixes # (issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring / Chore

Design Doc Requirement

• I have read docs/vision/PHILOSOPHY.md and docs/design/OUTPUT_DESIGN.md.
• This change is accompanied by a new or updated design doc in docs/features/ (if it's a new feature).

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or type errors
• (If applicable) I have updated the Markdown export tests or output templates