Koreader progress sync interface (#3025)

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

API/DTOs/Koreader/KoreaderBookDto.cs

@@ -0,0 +1,33 @@
+using API.DTOs.Progress;
+
+namespace API.DTOs.Koreader;
+
+/// <summary>
+/// This is the interface for receiving and sending updates to Koreader. The only fields
+/// that are actually used are the Document and Progress fields.
+/// </summary>
+public class KoreaderBookDto
+{
+    /// <summary>
+    /// This is the Koreader hash of the book. It is used to identify the book.
+    /// </summary>
+    public string Document { get; set; }
+    /// <summary>
+    /// A randomly generated id from the koreader device. Only used to maintain the Koreader interface.
+    /// </summary>
+    public string Device_id { get; set; }
+    /// <summary>
+    /// The Koreader device name. Only used to maintain the Koreader interface.
+    /// </summary>
+    public string Device { get; set; }
+    /// <summary>
+    /// Percent progress of the book. Only used to maintain the Koreader interface.
+    /// </summary>
+    public float Percentage { get; set; }
+    /// <summary>
+    /// An XPath string read by Koreader to determine the location within the epub.
+    /// Essentially, it is Koreader's equivalent to ProgressDto.BookScrollId.
+    /// </summary>
+    /// <seealso cref="ProgressDto.BookScrollId"/>
+    public string Progress { get; set; }
+}