Add ASP.NET example that only uses Program (HostBuilder) and not Startup

[soroshsabz]

ITNOA

I think it is good add .NET 6 Web API example

[soroshsabz]

https://stackoverflow.com/a/70147206/1539100

[tillig]

• I don't know what ITNOA is.
• The current AspNetCoreExample is for .NET 6.

I'm going to update the title of the issue because it appears the request here is about showing an example that doesn't use a Startup class. That's something we can do.