♻️ Basically completed the separate of account service

DysonNetwork.Shared/Data/ModelBase.cs

@@ -0,0 +1,15 @@
+using NodaTime;
+
+namespace DysonNetwork.Shared.Data;
+
+public interface IIdentifiedResource
+{
+    public string ResourceIdentifier { get; }
+}
+
+public abstract class ModelBase
+{
+    public Instant CreatedAt { get; set; }
+    public Instant UpdatedAt { get; set; }
+    public Instant? DeletedAt { get; set; }
+}