Add IAuditableEntity

Jellyfin.Data/Interfaces/IAuditableEntity.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Jellyfin.Data.Interfaces
+{
+    /// <summary>
+    /// An interface representing an entity that has creation/modification dates.
+    /// </summary>
+    public interface IAuditableEntity
+    {
+        /// <summary>
+        /// Gets the date this entity was created.
+        /// </summary>
+        public DateTime DateCreated { get; }
+
+        /// <summary>
+        /// Gets or sets the date this entity was modified.
+        /// </summary>
+        public DateTime DateModified { get; set; }
+    }
+}