Add project files.

Core.Blueprint.Service.UseCases/GetOneSampleItem/GetOneSampleItemHandler.cs

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+using Core.Blueprint.Service.External.Clients.SampleItemClient;
+using Core.Blueprint.Service.UseCases.GetOneSampleItem.Input;
+using Core.Blueprint.Service.UseCases.GetOneSampleItem.Ports;
+using FluentValidation;
+using Lib.Architecture.BuildingBlocks;
+
+namespace Core.Blueprint.Service.UseCases.GetOneSampleItem
+{
+    public class GetOneSampleItemHandler(IGetOneSampleItemPort port, IValidator<GetOneSampleItemRequest> validator, ISampleItemClientService clientService) : IComponentHandler<GetOneSampleItemRequest>
+    {
+        private readonly IGetOneSampleItemPort _port = port;
+        private readonly IValidator<GetOneSampleItemRequest> _validator = validator;
+        private readonly ISampleItemClientService _clientService = clientService;
+
+        public async ValueTask ExecuteAsync(GetOneSampleItemRequest command, CancellationToken cancellationToken = default)
+        {
+            try
+            {
+                if (!command.IsValid(_validator))
+                {
+                    _port.ValidationErrors(command.Notifications);
+                    return;
+                }
+
+                var result = await _clientService.GetSampleItemAsync(command.Id);
+
+                if (result == null)
+                {
+                    _port.NoContentSuccess();
+                    return;
+                }
+
+                _port.Success(result);
+            }
+            catch(Exception ex)
+            {
+                _port.BusinessError(ex.Message);
+            }
+
+        }
+    }
+}