SpecFlow structure added and initial accessibility test created

[antk43]

Overview

This PR adds SpecFlow to the Web.Tests project along with an initial accessibility test on the homepage.

Major changes

• Axe Core, Fluent Assertions, Selenium WebDriver Chrome, and SpecFlow packages added to Web.Test.
• Features directory with respective AccessbilityTests.feature file containing accessibility scenario and test steps.
• Steps directory with respective AccessibilitySteps.cs step definition file containing code for test steps.
• Hooks directory with respective SpecFlowHooks.cs for setting up and tearing down the web app and the WebDriver.
• build.yml updated to run-on: windows-latest to be able to run Selenium.
  • information on GitHub hosted runners here: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idruns-on

ToDo

Next round of work to possibly include the following:

• Currently we start the web app through starting the .exe in SpecFlowHooks.cs - is there a better way to run the app?
• Add Selenium options including running in Headless et al.
• Add AccessibilityOptions.cs as per SD test project.
• Add logging of accessibility test to output file.