Made Images to property in Update

CoviDok/Data/Model/Update.cs

@@ -14,7 +14,10 @@ namespace CoviDok.Data.Model
         public Role SenderRole { get; set; }
         public string Content { get; set; }
         public DateTime CreatedDate { get; set; }
-
-        public ICollection<string> Images = new List<string>();
+        public List<string> Images { get; set; }
+        public Update()
+        {
+            Images = new List<string>();
+        }
     }
 }