Update free-courses-ar.md

[Adamkaram]

adding more courses on operating system

What does this PR do?

adding more courses on operating system

Why is this valuable (or not)?

i've learn from these resources and were quit good

How do we know it's really free?

youtube courses

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

course

Checklist:

• Read our contributing guidelines.
• 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!

[Adamkaram]

why linter keep giving me these errors and nothing wrong with my alphapetical ordering ?

[eshellman]

Be sure to check the free-programming-books-lint output for linter errors. Alphabetical order and spacing are the most common problems.

[Adamkaram]

Be sure to check the free-programming-books-lint output for linter errors. Alphabetical order and spacing are the most common problems.

done

[eshellman]

Thanks, and welcome to free-programming-books!
You might look at cleaning up the right to left markup in this list - look at #6714 for info

[Adamkaram]

Thanks, and welcome to free-programming-books! You might look at cleaning up the right to left markup in this list - look at #6714 for info

woww i like this