DB仕様書の追加

[muroshima]

DB仕様書を追加しました。

ローカル環境で正常に表示できることを確認しています。

Summary by CodeRabbit

• Documentation
  • Introduced a new document detailing the database schema and entity-relationship diagram (ERD).
  • Added a link to the database specifications in the hero section of the documentation.

[coderabbitai[bot]]

Walkthrough

The project documentation has been enhanced with the addition of a new ERD section. This section provides a detailed view of the database schema, focusing on the ReadHistory entity. Additionally, the main index page has been updated to include a link to this new database specification, ensuring easy navigation for users interested in the database design.

Changes

File Path	Change Summary
docs/erd.md	Introduced documentation for the database schema and ERD of the ReadHistory entity.
docs/index.md	Added a link to the new ERD section under the hero section.

🐇✨ To the docs, we hop and add, An ERD so clear, never bad. With links that click, we leap with cheer, Schema's mapped, the path is clear! 🎉

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[muroshima]

以下のように修正後の表示ができること確認しました！