Add validation notes to DAT types

SabreTools.DatFiles/Formats/Listrom.cs

@@ -14,6 +14,9 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a MAME Listrom DAT
     /// </summary>
+    /// <remarks>
+    /// TODO: Check and enforce required fields in output
+    /// </remarks>
     internal class Listrom : DatFile
     {
         /// <summary>