Add project files.

Core.Blueprint.Service.UseCases/GetOneSampleItem/Validator/GetOneSampleItemValidator.cs

@@ -0,0 +1,15 @@
+using Core.Blueprint.Service.UseCases.GetOneSampleItem.Input;
+using FluentValidation;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Core.Blueprint.Service.UseCases.GetOneSampleItem.Validator
+{
+    [ExcludeFromCodeCoverage]
+    public class GetOneSampleItemValidator : AbstractValidator<GetOneSampleItemRequest>
+    {
+        public GetOneSampleItemValidator()
+        {
+            RuleFor(i => i.Id).NotNull().NotEmpty().WithMessage("Is required.");
+        }
+    }
+}