user create command and user repo

dotnet/AipsCore/Domain/Models/User/External/IUserRepository.cs

@@ -0,0 +1,9 @@
+using AipsCore.Domain.Models.User.ValueObjects;
+
+namespace AipsCore.Domain.Models.User.External;
+
+public interface IUserRepository
+{
+    Task<User?> Get(UserId userId, CancellationToken cancellationToken = default);
+    Task Save(User user, CancellationToken cancellationToken = default);
+}