Added separate sections for Data Structures and Algorithms section in…

[vishal-sharma-369]

… free-programming-books-hi.md

solves #7323

What does this PR do?

Added separate sections for Data Structures and Algorithms section in books/free-programming-books-hi.md

Why is this valuable (or not)?

This improves the structure of the Data Structure and Algorithm books section in free-programming-books-hi.md file

How do we know it's really free?

The PR only changes the structure of the code. It does not includes any valuable content.

Checklist:

• [ x] Read our contributing guidelines.
• Search for duplicates.
• Include author(s) and platform where appropriate.
• [ x] Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• [ x] Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[eshellman]

It's usually not helpful to add a category for a single resource. Try to find another category, or see if there are other books in our lists that would fit into your category.