* Update free-programming-books-ar.md

Added AVR section

* Update free-programming-books-ar.md

* Update free-programming-books-ar.md

* Pick title and author from book cover

Simply AVR: From Blinking led to RTOS

تعلم تَصميم الأنظمة المُدمَجة
من تشغيل دايود ضوئي
إلى أنظمة الوقت الحقيقي

by Abdallah Ali Abdallah Elmasri

http://simplyarduino.com/?page_id=889Co-authored-by: NImVector <59611597+LuigiImVector@users.noreply.github.com>

* chore: Moving from AVR to Arduino

* chore: Moving from AVR to Arduino

* chore: Moving from AVR to Arduino
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NImVector <59611597+LuigiImVector@users.noreply.github.com>