Add OutResController with MediatR integration

Introduced a new `OutResController` in the `ReC.API.Controllers`
namespace to handle API requests. The controller uses MediatR
for request handling and is decorated with `[ApiController]`
and `[Route("api/[controller]")]` attributes.

Added a `Get` method to process `ReadOutResQuery` objects
from query parameters and return the result via MediatR.
Included necessary `using` directives for dependencies.

src/ReC.API/Controllers/OutResController.cs

@@ -0,0 +1,12 @@
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+using ReC.Application.OutResults.Queries;
+
+namespace ReC.API.Controllers;
+
+[Route("api/[controller]")]
+[ApiController]
+public class OutResController(IMediator mediator) : ControllerBase
+{
+    public async Task<IActionResult> Get([FromQuery] ReadOutResQuery query) => Ok(await mediator.Send(query));
+}