user create command and user repo

dotnet/AipsCore/Application/Models/User/Command/CreateUserCommand.cs

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+using AipsCore.Application.Abstract.Command;
+using AipsCore.Domain.Models.User.ValueObjects;
+
+namespace AipsCore.Application.Models.User.Command;
+
+public record CreateUserCommand(string Username, string Email) : ICommand<UserId>, ICommand;

dotnet/AipsCore/Application/Models/User/Command/Handler/CreateUserCommandHandler.cs

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+using AipsCore.Application.Abstract.Command;
+using AipsCore.Domain.Common.ValueObjects;
+using AipsCore.Domain.Models.User.External;
+using AipsCore.Domain.Models.User.ValueObjects;
+
+namespace AipsCore.Application.Models.User.Command.Handler;
+
+public class CreateUserCommandHandler : ICommandHandler<CreateUserCommand>
+{
+    private readonly IUserRepository _userRepository;
+
+    public CreateUserCommandHandler(IUserRepository userRepository)
+    {
+        _userRepository = userRepository;
+    }
+    
+    public async Task Handle(CreateUserCommand command, CancellationToken cancellationToken = default)
+    {
+        var user = Domain.Models.User.User.Create(command.Email, command.Username); 
+        
+        await _userRepository.Save(user, cancellationToken);
+    }
+}