user create command and user repo

dotnet/AipsCore/Domain/Common/ValueObjects/DomainId.cs

@@ -2,6 +2,7 @@
 using AipsCore.Domain.Abstract.Rule;
 using AipsCore.Domain.Abstract.ValueObject;
 using AipsCore.Domain.Common.Validation;
+using AipsCore.Domain.Common.Validation.Rules;
 
 namespace AipsCore.Domain.Common.ValueObjects;
 
@@ -17,6 +18,8 @@ public record DomainId : AbstractValueObject
 
     protected override ICollection<IRule> GetValidationRules()
     {
-        return [];
+        return [
+            new MinLengthRule(IdValue, 5)
+        ];
     }
 }

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);
+}

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

@@ -15,4 +15,19 @@ public class User
         Email = email;
         Username = username;
     }
+    
+    public static User Create(string id, string email, string username)
+    {
+        var userIdVo = new UserId(id);
+        var usernameVo = new Username(username);
+        var emailVo = new Email(email);
+        return new User( userIdVo, emailVo, usernameVo);
+    }
+    
+    public static User Create(string email, string username)
+    {
+        var usernameVo = new Username(username);
+        var emailVo = new Email(email);
+        return new User( UserId.Any(), emailVo, usernameVo);
+    }
 }

dotnet/AipsCore/Domain/Models/User/ValueObjects/UserId.cs

@@ -2,4 +2,7 @@
 
 namespace AipsCore.Domain.Models.User.ValueObjects;
 
-public record UserId(string IdValue) : DomainId(IdValue);
+public record UserId(string IdValue) : DomainId(IdValue)
+{
+    public static UserId Any() => new(Guid.NewGuid().ToString());
+}