Moved projects to their own separate subdirectories

API/YABA.Models/Interfaces/IDateCreatedTrackable.cs

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+using System;
+
+namespace YABA.Models.Interfaces
+{
+    public interface IDateCreatedTrackable
+    {
+        public DateTimeOffset CreatedOn { get; set; }
+    }
+}

API/YABA.Models/Interfaces/IDateModifiedTrackable.cs

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+using System;
+
+namespace YABA.Models.Interfaces
+{
+    public interface IDateModifiedTrackable
+    {
+        public DateTimeOffset LastModified { get; set; }
+    }
+}

API/YABA.Models/Interfaces/IIdentifiable.cs

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+
+namespace YABA.Models.Interfaces
+{
+    public interface IIdentifiable
+    {
+        public int Id { get; set; }
+    }
+}

API/YABA.Models/Interfaces/ISoftDeletable.cs

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+
+namespace YABA.Models.Interfaces
+{
+    public interface ISoftDeletable
+    {
+        public bool IsDeleted { get; set; }
+    }
+}