Add an Arabic version of the README file (trekhleb#622)

* add the DS link * Finish translating math * add Arabic version of the README FILE * add Arabic version of the README FILE * add the arabic readme file link to main readme file * add the arabic readme file link to main readme file * add the arabic readme file link to main readme file Co-authored-by: Oleksii Trekhleb <trehleb@gmail.com>

Author: B3ns44d