More documentation - almost all Models done

https://github.com/oqtane/oqtane.framework/issues/1382
Should not contain any code changes, just docs

Oqtane.Shared/Models/Notification.cs

@@ -3,25 +3,95 @@ using System.ComponentModel.DataAnnotations.Schema;
 
 namespace Oqtane.Models
 {
+    /// <summary>
+    /// Notification for a User - usually meant to be sent as an E-Mail.
+    /// </summary>
     public class Notification : IDeletable
     {
+        /// <summary>
+        /// Internal ID
+        /// </summary>
         public int NotificationId { get; set; }
+
+        /// <summary>
+        /// Reference to the <see cref="Site"/> on which the Notification was created. 
+        /// </summary>
         public int SiteId { get; set; }
+
+        /// <summary>
+        /// Creator <see cref="User"/> ID
+        /// </summary>
         public int? FromUserId { get; set; }
+
+        /// <summary>
+        /// Nice Name of the Creator
+        /// </summary>
         public string FromDisplayName { get; set; }
+
+        /// <summary>
+        /// Creator E-Mail
+        /// </summary>
         public string FromEmail { get; set; }
+
+        /// <summary>
+        /// Recipient <see cref="User"/> ID - nullable, as Recipient could be someone that's not a user. 
+        /// </summary>
         public int? ToUserId { get; set; }
+
+        /// <summary>
+        /// Recipient Nice-Name.
+        /// </summary>
         public string ToDisplayName { get; set; }
+
+        /// <summary>
+        /// Recipient Mail
+        /// </summary>
         public string ToEmail { get; set; }
+
+        /// <summary>
+        /// Reference to an optional Parent <see cref="Notification"/> - in case it's a kind of thread with reply-messages.
+        /// </summary>
         public int? ParentId { get; set; }
+
+        /// <summary>
+        /// Message Subject.
+        /// </summary>
         public string Subject { get; set; }
+
+        /// <summary>
+        /// Body / Contents of this Notification
+        /// </summary>
         public string Body { get; set; }
+
+        /// <summary>
+        /// When the notification was created. 
+        /// </summary>
         public DateTime CreatedOn { get; set; }
+
+        /// <summary>
+        /// If it has been delivered. See also <see cref="DeliveredOn"/>.
+        /// </summary>
         public bool IsDelivered { get; set; }
+
+        /// <summary>
+        /// When the Notification was sent/delivered.
+        /// </summary>
         public DateTime? DeliveredOn { get; set; }
+
+        #region IDeletable
+        
+        /// <inheritdoc />
         public string DeletedBy { get; set; }
+        /// <inheritdoc />
         public DateTime? DeletedOn { get; set; }
+        /// <inheritdoc />
         public bool IsDeleted { get; set; }
+
+        #endregion
+
+        /// <summary>
+        /// When the Notification _should_ be sent. See also <see cref="DeliveredOn"/>
+        /// </summary>
         public DateTime? SendOn { get; set; }
 
         public Notification() {}