Sample for how to use appsettings.json + overrides to populate web.config/app.config AppSettings and ConnectionStrings
This sample application shows how to use configuration builders (introduced in .NET 4.7.1) and the
configuration system introduced in ASP.NET Core (Microsoft.Extensions.Configuration) to load
appsettings.json files and overriding per-environment files like appsettings.Development.json
to populate app settings and connection strings usually set in web.config (also works for console apps
and App.config).