engindemirog/nArchitecture — reverse-engineered prompt

Build me a C# .NET solution called nArchitecture that works as a clean starter kit for future backend projects. I don’t have a detailed spec, so keep it practical and easy to understand.

I want the code organized under a src folder with separate areas for business rules, application logic, data access, and a runnable API or demo app so I can see how everything connects. Include one simple sample feature that shows the full flow, from request, to validation, to business logic, to saving or reading data.

Please make the solution open cleanly in Visual Studio or Rider, with sensible project references and basic error handling. Add a short README that explains how to run it, how the parts fit together, and how someone could copy the pattern for their own project.

Keep it beginner friendly, but structured enough that it feels like a real architecture template. Look up current .NET docs online if you need to.