Create Sale/Add action

Api/Controllers/SaleController.cs

@@ -0,0 +1,46 @@
+using Application.Commands.SaleCommands;
+using Application.Exceptions;
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Api.Controllers;
+[Route("api/[controller]")]
+[ApiController]
+public class SaleController(IMediator mediator) : ControllerBase
+{
+    private readonly IMediator _mediator = mediator;
+
+    [HttpPost]
+    [Route("Add")]
+    [ProducesResponseType(200)]
+    [ProducesResponseType<ErrorDto>(404)]
+    public async Task<ActionResult> Add(string wholesalerId, string beerId, int quantity)
+    {
+        try
+        {
+            await _mediator.Send(new CreateSaleCommand(wholesalerId, beerId, quantity));
+
+            return Ok();
+        }
+        catch (WholesalerNotFoundException exception)
+        {
+            return CreateWholesalerNotFoundResult(exception);
+        }
+        catch (BeerNotFoundException exception)
+        {
+            return CreateBeerNotFoundResult(exception);
+        }
+    }
+
+    private NotFoundObjectResult CreateWholesalerNotFoundResult(WholesalerNotFoundException exception)
+    {
+        var message = $"Wholesaler with id '{exception.ResourceId}' was not found.";
+        return NotFound(new ErrorDto(exception, message));
+    }
+
+    private NotFoundObjectResult CreateBeerNotFoundResult(BeerNotFoundException exception)
+    {
+        var message = $"Beer with id '{exception.ResourceId}' was not found.";
+        return NotFound(new ErrorDto(exception, message));
+    }
+}