Final exercise from: https://materiaalit.github.io/2013-oo-programming/part2/week-9/
Let's create an application to manage people phone numbers and addresses. 1 adding a phone number to the relative person 2 phone number search by person 3 name search by phone number 4 adding an address to the relative person 5 personal information search (search for a person's address and phone number) 6 removing a person's information 7 filtered search by keyword (retrieving a list which must be sorted by name in alphabetic order), the keyword can appear in the name or address