Menus for add customer and set active customer

[krysmathis]

Link to Ticket

1 User Should Be Able To Add Customer

Description of Proposed Changes

• Cleaned up CustomerManager.cs -> all tests should still pass
• Added menu structure to the add customer
• Added menu structure for setting the active customer

Steps to Test

Outline the steps to test

git fetch --all
git checkout km-customer-add-menu
# navigate to test project
dotnet restore
dotnet test

Testing the menu options

In the main project: bangazon-cli

dotnet run

1. Select option 1
2. Add data according to the prompts - should return to the main menu after prompt
3. From the main menu, select option 2
4. Select the newly created customer
5. The menu should update to show the active customer in the header

Impacted Areas in Application

List general components of the application that this PR will affect:

• CustomerManager.cs
• Program.cs
• Menus/AddCustomerMenu.cs
• Menus/ActiveCustomerManager.cs

Mentions @username

Tag users that need to review this code

Definition of Done

1. The project must be fully documented. This includes the following:
   1. Complete README that documents the steps to install the code, how to install any dependencies, or system configuration needed.
   2. Every class must be documented with purpose, author, and methods.
   3. Every method must be documented with purpose and argument list - which itself must contain a short purpose for each argument.
2. The project must be able to run fully, and without errors, on each teammate's system.
3. Fulfills every requirement. Every line of code has been peer reviewed.
4. For projects that require unit testing, core functionality must be identified and have at least one test for each.

[kimberly-bird]

It worked! 👍

[DreRandaci]

👍