repo creation with initial code after cloning public repo

MediaBrowser.Common/RequiresSourceSerialisationAttribute.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace MediaBrowser.Common;
+
+/// <summary>
+/// Marks a BaseItem as needing custom serialisation from the Data field of the db.
+/// </summary>
+[System.AttributeUsage(System.AttributeTargets.Class, Inherited = true, AllowMultiple = false)]
+public sealed class RequiresSourceSerialisationAttribute : System.Attribute
+{
+}