Implement image comparison command

CHDataManagement/Storage/Model/Settings/PageSettingsFile.swift

@@ -16,6 +16,10 @@ struct PageSettingsFile {
     let audioPlayerCssFile: String?
 
     let modelViewerJsFile: String?
+
+    let imageCompareJsFile: String?
+
+    let imageCompareCssFile: String?
 }
 
 extension PageSettingsFile: Codable {
@@ -32,6 +36,8 @@ extension PageSettingsFile {
               codeHighlightingJsFile: nil,
               audioPlayerJsFile: nil,
               audioPlayerCssFile: nil,
-              modelViewerJsFile: nil)
+              modelViewerJsFile: nil,
+              imageCompareJsFile: nil,
+              imageCompareCssFile: nil)
     }
 }