Add envelope notification contracts

EnvelopeGenerator.Application/Common/Interfaces/Services/Notification/DocumentSignedNotification.cs

@@ -0,0 +1,37 @@
+namespace EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+
+/// <summary>
+/// 
+/// </summary>
+public record DocumentSignedNotification
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string DocumentTitle { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string NameReceiver { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string NamePortal { get; init; } = "signFLOW Portal";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required byte[] Attachment { get; init; }
+}
+
+/*
+
+Umschlag abgeschlossen: '[DOCUMENT_TITLE]'
+
+---
+
+Guten Tag [NAME_RECEIVER],<br />  <br />  Der Vorgang <B><I>'[DOCUMENT_TITLE]'</I></B> wurde erfolgreich abgeschlossen.<br />  <br />  Sie erhalten das Dokument mit einem detaillierten Ergebnisbericht als Anhang zu dieser Email.<br />  <br />  Mit freundlichen Grüßen<br />  <br />  [NAME_PORTAL]
+
+*/

EnvelopeGenerator.Application/Common/Interfaces/Services/Notification/IEnvelopeNotificationService.cs

@@ -0,0 +1,16 @@
+namespace EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+
+/// <summary>
+/// 
+/// </summary>
+public interface IEnvelopeNotificationService
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="email"></param>
+    /// <param name="documentSigned"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    public Task Notify(string email, DocumentSignedNotification documentSigned, CancellationToken cancel = default);
+}