Calculation of available quantities

[krysmathis]

Link to Ticket

Description of Proposed Changes

• Two new methods on OrderManager
  • getAvailableQuantity - returns an int, this is the result of subtracting total ordered quantity from the product quantity (initial inventory)
  • hadAvailableQuantity - returns a bool depending if it has available quantity

Steps to Test

Outline the steps to test

All Tests Should Pass

git fetch --all
git checkout km-available-quantities
cd bangazon-cli.Tests
dotnet restore
dotnet test

Impacted Areas in Application

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

• OrderManager.cs

Mentions @username

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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]

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[Chewieez]

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