Add initial ASP.NET Core project structure

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.

src/presentation/DigitalData.TaskFlow.API/DigitalData.TaskFlow.API.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Controllers\" />
+  </ItemGroup>
+
+</Project>