Add Data Structure & Algorithm book

[Sathi-Seth]

What does this PR do?

Add resource(s) | Remove resource(s) | Add info | Improve repo

Add resource

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For resources

Description

Why is this valuable (or not)?

How do we know it's really free?

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

Checklist:

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

Follow-up

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

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-subjects.md
94:1-136:201  warning  Alphabetical ordering: swap l.136 and l.135                            alphabetize-lists  remark-lint
94:1-136:201  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-subjects.md
94:1-136:104  warning  Alphabetical ordering: swap l.113 and l.112  alphabetize-lists  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-subjects.md
94:1-136:104  warning  Alphabetical ordering: swap l.112 and l.111  alphabetize-lists  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-subjects.md
95:1-137:104  warning  Alphabetical ordering: swap l.112 and l.111  alphabetize-lists  remark-lint