chore: import Musify.WebApi into monorepo (preserving history)

git-subtree-dir: Musify.WebApi
git-subtree-mainline: 9d433868cc
git-subtree-split: ca8750c3b4

Musify.WebApi/WebApi/Validators/Users/CreateUserRequestValidator.cs

@@ -0,0 +1,25 @@
+using FluentValidation;
+using WebApi.DataTransferObjects.Users;
+
+namespace WebApi.Validators.Users;
+
+public sealed class CreateUserRequestValidator : AbstractValidator<CreateUserRequest>
+{
+    public CreateUserRequestValidator()
+    {
+        RuleFor(x => x.Id)
+            .NotEmpty();
+
+        RuleFor(x => x.Name)
+            .NotEmpty()
+            .MaximumLength(48);
+
+        RuleFor(x => x.FirstName)
+            .MaximumLength(48)
+            .When(x => x.FirstName is not null);
+
+        RuleFor(x => x.SecondName)
+            .MaximumLength(48)
+            .When(x => x.SecondName is not null);
+    }
+}