feat: Add Database Design 2nd ed.

[AdityaSirsalkar001]

Adds a resource.

IMPORTANT

• I have read the contributing guidelines.
• This is not a revision of a previously submitted PR.

For resources

Description

Adds the open textbook "Database Design – 2nd Edition" by Adrienne Watt to the Databases section of the subjects list (books/free-programming-books-subjects.md).

Why is this valuable (or not)?

It is a high-quality, comprehensive, university-level textbook on fundamental database design concepts. It is published as an Open Educational Resource (OER), making it a valuable and reliable addition for learners.

How do we know it's really free?

The book is hosted on BCcampus, a government-funded open education platform. The book's copyright page explicitly states it is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

For book lists, is it a book? For course lists, is it a course? etc.

Yes, this is a book (an open textbook).

Checklist:

• I have searched for duplicates.
• The author's name is included in the new entry.
• The new entry is placed in the correct alphabetical order.
• The entry includes format (HTML, PDF, etc.) and license (CC BY) indications.
• I have used an informative name for this pull request.

[github-actions]

Oh no 😟! Conflicts have been found.

Please 🙏, take a moment and address the merge conflicts of your pull request before we can evaluate it again.

Thanks in advance for your effort and patience ❤️!

[eshellman]

don't reformat the file