absolutesrl/change-tracker-dotnet-sdk — reverse-engineered prompt

Build me a C# .NET Framework SDK for the Absolute ChangeTracker service. I want developers to be able to install it from NuGet and use it on the server side to send data to ChangeTracker and read data back without having to deal with raw HTTP calls. Keep the public API simple and documented with clear method names, sensible models, error handling, and basic configuration for credentials and the service endpoint.

Please include a small test project that shows the main flows and a README with installation commands, a tiny usage example, and a link to the official ChangeTracker docs. The package should be ready to build from the solution and easy to publish later.

Look up the current ChangeTracker docs online if you need the exact endpoints or data shape.