* Add "Raspberry Pi basics course" from forbot.pl

* fix order

* Update books/free-programming-books-pl.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Review changes
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>