You can download 3 ready layouts here, choose one of them :

Download link : http://repository.nabil.cc/arabic_phonetic_layouts.zip

Youtube explanation : https://www.youtube.com/watch?v=iJ4WverX8NU

Download, decompress and install the setup, and you have your layout, just use alt + shift (or go to the language choice near the clock) to change the language.

This is a comparaison image of the distribution of the these layouts

If you have any suggestions leave a message.