Добавил два поля

Shipyard/ShipyardContracts/BindingModels/MessageInfoBindingModel.cs

@@ -20,5 +20,7 @@ namespace ShipyardContracts.BindingModels
         public string Body { get; set; } = string.Empty;
 
         public DateTime DateDelivery { get; set; }
+        public bool IsRead { get; private set; } = false;
+        public string? AnswerText { get; private set; }
     }
 }

Shipyard/ShipyardContracts/ViewModels/MessageInfoViewModel.cs

@@ -25,5 +25,11 @@ namespace ShipyardContracts.ViewModels
 
         [DisplayName("Текст")]
         public string Body { get; set; } = string.Empty;
+
+        [DisplayName("Прочитано")]
+        public bool IsRead { get; private set; } = false;
+
+        [DisplayName("Ответ")]
+        public string? AnswerText { get; private set; }
     }
 }

Shipyard/ShipyardDataBaseImplement/Models/Message.cs

@@ -25,6 +25,8 @@ namespace ShipyardDataBaseImplement.Models
 
         public string Body { get; private set; } = string.Empty;
 
+        public bool IsRead { get; private set; } = false;
+        public string? AnswerText { get; private set; }
         public Client? Client { get; private set; }
         public static Message? Create(MessageInfoBindingModel model)
         {

Shipyard/ShipyardDataModels/Models/IMessageInfoModel.cs

@@ -19,5 +19,8 @@ namespace ShipyardDataModels.Models
         string Subject { get; }
 
         string Body { get; }
+
+        bool IsRead { get; }
+        string? AnswerText { get; }
     }
 }

Shipyard/ShipyardFileImplement/Models/Message.cs

@@ -23,6 +23,8 @@ namespace ShipyardFileImplement.Models
         public string Subject { get; private set; } = string.Empty;
 
         public string Body { get; private set; } = string.Empty;
+        public bool IsRead { get; private set; } = false;
+        public string? AnswerText { get; private set; }
         public static Message? Create(MessageInfoBindingModel model)
         {
             if (model == null)

Shipyard/ShipyardListImplement»/Models/Message.cs

@@ -22,6 +22,8 @@ namespace ShipyardListImplement_.Models
         public string Subject { get; private set; } = string.Empty;
 
         public string Body { get; private set; } = string.Empty;
+        public bool IsRead { get; private set; } = false;
+        public string? AnswerText { get; private set; }
 
         public static Message? Create(MessageInfoBindingModel model)
         {