Add Italian phone number validation method

Summary:
Added a new validation methodphoneIT. This method allows the validation of Italian phone numbers according to the standard format used in Italy.

Details:

• Added thephoneIT method to validate Italian phone numbers.
• The method checks whether the input follows the format of Italian phone numbers, including the country code (+39).

Usage:

$("#myForm").validate({rules:{phone:{required:true,phoneIT:true}}});