Added information on PhoneNumber
Added information on PhoneNumber

lukebeer/libphonenumber-for-php,sudiptpa/libphonenumber-for-php,giggsey/libphonenumber-for-php,Xephi/libphonenumber-for-php,gencer/libphonenumber-for-php,BenMorel/libphonenumber-for-php,digideskio/libphonenumber-for-php