Koreader Progress Sync (#3823)

Co-authored-by: Joseph Milazzo <josephmajora@gmail.com>

API/DTOs/Koreader/KoreaderProgressUpdateDto.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace API.DTOs.Koreader;
+
+public class KoreaderProgressUpdateDto
+{
+    /// <summary>
+    /// This is the Koreader hash of the book. It is used to identify the book.
+    /// </summary>
+    public string Document { get; set; }
+    /// <summary>
+    /// UTC Timestamp to return to KOReader
+    /// </summary>
+    public DateTime Timestamp { get; set; }
+}