added Strivers A2Z dsa course

[dakshgopani]

What does this PR do?

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

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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

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[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-hi.md
81:1-88:150  warning  Alphabetical ordering: swap l.83 and l.82  alphabetize-lists  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-en.md
       1:1  warning  Missing newline character at end of file                               final-newline      remark-lint
  3:1-7:42  warning  Alphabetical ordering: swap l.5 and l.3                                alphabetize-lists  remark-lint
  3:1-7:42  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint
11:1-13:65  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

free-programming-books/courses/free-courses-hi.md
81:1-88:150  warning  Alphabetical ordering: swap l.83 and l.82  alphabetize-lists  remark-lint