Add Korean book

[maldron0309]

What does this PR do?

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

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:

• [x] Read our contributing guidelines.
• [x] Search for duplicates.
• [x] Include author(s) and platform where appropriate.
• [x] Put lists in alphabetical order, correct spacing.
• [x] 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!

[github-actions[bot]]

Linter failed, fix the error(s):

  free-programming-books/books/free-programming-books-ko.md
   59:1-59:6  warning  Incorrect number of blank lines between heading and section  blank-lines-1-0-2  remark-lint
  60:1-64:76  warning  Alphabetical ordering: swap l.61 and l.60                    alphabetize-lists  remark-lint
  67:1-67:26  warning  Incorrect number of blank lines between heading and section  blank-lines-1-0-2  remark-lint