Added three new projects: `DigitalData.TaskFlow.Domain`,
`DigitalData.TaskFlow.Application`, and
`DigitalData.TaskFlow.Infrastructure` to the solution.
Updated the solution file to include their paths, GUIDs,
build configurations, and nested structure.
Each project targets `.NET 8.0`, uses `Microsoft.NET.Sdk`,
and enables implicit usings and nullable reference types.
Introduced an `ExtensibilityGlobals` section with a
`SolutionGuid` for better solution management.
This commit introduces the initial setup for the DigitalData.TaskFlow solution:
- Added `DigitalData.TaskFlow.sln` to organize the project structure into `src`, `presentation`, `core`, and `infrastructure` folders.
- Created `DigitalData.TaskFlow.API` project targeting .NET 8.0 with nullable reference types and Swagger/OpenAPI support.
- Added `Program.cs` to configure the ASP.NET Core application with services, middleware, and Swagger UI.
- Added `launchSettings.json` for development profiles and environment variables.
- Added `appsettings.json` and `appsettings.Development.json` for logging and configuration.
