arrange folder structure of notification

EnvelopeGenerator.Application/Notifications/DocSigned/Handlers/AnnotationHandler.cs

@@ -0,0 +1,39 @@
+using EnvelopeGenerator.Application.DocStatus.Commands;
+using EnvelopeGenerator.Domain.Constants;
+using MediatR;
+using Newtonsoft.Json;
+
+namespace EnvelopeGenerator.Application.Notifications.DocSigned.Handlers;
+
+/// <summary>
+/// 
+/// </summary>
+public class AnnotationHandler : INotificationHandler<DocSignedNotification>
+{
+    private readonly ISender _sender;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="sender"></param>
+    public AnnotationHandler(ISender sender)
+    {
+        _sender = sender;
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="notification"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    public async Task Handle(DocSignedNotification notification, CancellationToken cancel)
+    {
+        await _sender.Send(new SaveDocStatusCommand()
+        {
+            Envelope = new() { Id = notification.EnvelopeId },
+            Receiver = new() { Id = notification.ReceiverId},
+            Value = JsonConvert.SerializeObject(notification.Annotations, Format.Json.ForAnnotations)
+        }, cancel);
+    }
+}