Contact App 2

This is a simple Go program that manages a list of contacts. It defines two types, Contact and Contacts. The Contact type represents a single contact with a name and phone number. The Contacts type is a map of contacts where the key is a unique ID for each contact.

The Contacts type has the following methods:

• AddContact: Adds a new contact to the Contacts map.
• GetContact: Retrieves a contact from the Contacts map by ID.
• UpdateContact: Updates an existing contact in the Contacts map.
• DeleteContact: Deletes a contact from the Contacts map.