Added documentation for the PHP requirements.
Added documentation for the PHP requirements.

rhee/phpsh,rjmi004/phpsh,terrorbox/phpsh,rhee/phpsh,chooaya/phpsh,AsafMah/phpsh,facebookarchive/phpsh,facebookarchive/phpsh,rhee/phpsh,rjmi004/phpsh,AsafMah/phpsh,chooaya/phpsh,terrorbox/phpsh,chooaya/phpsh,AsafMah/phpsh,terrorbox/phpsh,rjmi004/phpsh