Added support for notifications

LiteCharms.Models/Notification.cs

@@ -0,0 +1,26 @@
+namespace LiteCharms.Models;
+
+public class Notification
+{
+    public Guid Id { get; set; }
+
+    public DateTimeOffset CreatedAt { get; set; }
+
+    public NotificationDirection Direction { get; set; }
+
+    public string? Author { get; set; }
+
+    public string? Title { get; set; }
+
+    public string? Description { get; set; }
+
+    public string? Platform { get; set; }
+
+    public string? PlatformAddress { get; set; }
+
+    public string? CorrelationId { get; set; }
+
+    public string? CorrelationIdType { get; set; }
+
+    public bool IsInternal { get; set; }
+}