ContactsManager

1. Create a ContactsManager class and create instance of that class called myContactsManager using the default constructor
2. Create a new Contact class
   • Set the name to a friend's name
   • Set the phoneNumber field to their phone number
3. Call the addContact method in myContactsManager to add that contact
4. Repeat steps 2 and 3 for 4 more contacts
5. Search for a contact using the method searchContact and print out their phone number