first commit

MyNewProjectName.WebAPI/Controllers/BaseApiController.cs

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+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace MyNewProjectName.WebAPI.Controllers;
+
+/// <summary>
+/// Base API controller with common functionality
+/// </summary>
+[ApiController]
+[Route("api/[controller]")]
+public abstract class BaseApiController : ControllerBase
+{
+    private ISender? _mediator;
+
+    protected ISender Mediator => _mediator ??= HttpContext.RequestServices.GetRequiredService<ISender>();
+}