Ajout d'update pour patch + début validator

Knots/Validators/Group/DeleteGroupDtoValidator.cs

@@ -1,6 +1,15 @@
+using FastEndpoints;
+using FluentValidation;
+using Knots.DTO.Group;
+
 namespace Knots.Validators.Group;
 
-public class DeleteGroupDtoValidator
+public class DeleteGroupDtoValidator : Validator<DeleteGroupDto>
 {
-    
+    public  DeleteGroupDtoValidator()
+    {
+        RuleFor(x => x.Id)
+            .NotEmpty()
+            .WithMessage("Id is required");
+    }
 }