Blogs:
https://damienbod.com/2024/08/06/implementing-an-asp-net-core-api-with-net-9-and-openapi/
https://damienbod.com/2024/08/12/add-a-swagger-ui-using-a-net-9-json-openapi-file/
Install-Package Microsoft.AspNetCore.OpenApi -IncludePrerelease
https://github.com/martincostello/dotnet-minimal-api-integration-testing
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/minimal-apis/aspnetcore-openapi
https://learn.microsoft.com/en-us/aspnet/core/web-api/action-return-types
https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json
https://github.com/RicoSuter/NSwag
https://swagger.io/specification/