Lab 4 updates

[jongalloway]

This pull request mainly involves changes to the labs/4-Add-Shopping-Basket/README.md file. The changes are focused on improving the instructions for setting up a gRPC service project, implementing Redis storage logic, and updating the web site to provide a shopping basket feature. The changes include clarifications on where to create and modify files, corrections of typos, and additional instructions for using the .NET CLI.

Modifications to instructions:

• README.md: Instructions for setting up a gRPC service project have been updated to include steps for using the .NET CLI. The instructions now specify where to create and modify files in the Basket.API project. Typos in the template options for creating a new project have been corrected.
• README.md: Instructions for implementing Redis storage logic have been updated to specify where to create files in the Basket.API project. [1] [2]
• README.md: Instructions for updating the web site have been updated to specify where to modify files in the WebApp project. [1] [2]

Code corrections and improvements:

• README.md: A typo in the CustomerBasket class definition has been corrected.
• README.md: The AddApplicationServices method in HostingExtensions.cs has been updated to register the RedisBasketStore class in the application's DI container.
• README.md: The HostingExtensions.cs file has been updated to register the Basket.BasketClient gRPC client in the application's DI container and configure its Address property.

Other changes:

• README.md: The webapp resource has been updated to reference the basket-api resource.