- added a custom exception for maximum length messages, saves to time to sent to API

- added a constants file, for have constants to work with
- catching maximum message length

TelegramBotBase/Constants/Telegram.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TelegramBotBase.Constants
+{
+    public static class Telegram
+    {
+        /// <summary>
+        /// The maximum length of message text before the API throws an exception. (We will catch it before)
+        /// </summary>
+        public const int MaxMessageLength = 4096;
+
+    }
+}