hardcoded disclamer mail

AscNet.GameServer/Handlers/MailModule.cs

@@ -0,0 +1,31 @@
+using AscNet.Common.MsgPack;
+using MessagePack;
+
+namespace AscNet.GameServer.Handlers
+{
+    #region MsgPackScheme
+#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+    [MessagePackObject(true)]
+    public class MailReadResponse
+    {
+        public int Code;
+    }
+    
+    [MessagePackObject(true)]
+    public class MailReadRequest
+    {
+        public string Id;
+    }
+#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+    #endregion
+
+    internal class MailModule
+    {
+
+        [RequestPacketHandler("MailReadRequest")]
+        public static void MailReadRequestHandler(Session session, Packet.Request packet)
+        {
+            session.SendResponse(new MailReadResponse(), packet.Id);
+        }
+    }
+}