start working on custom chat handlers

CustomChatAddOns/Data/Ping.cs

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+using Kruzya.TelegramBot.Core.Attributes;
+using Newtonsoft.Json;
+using Telegram.Bot.Types;
+
+namespace Kruzya.TelegramBot.CustomChatAddOns.Data
+{
+    [AllowedSerializableType("ping")]
+    public class Ping
+    {
+        [JsonProperty("chat_id")]
+        public long ChatId { get; set; }
+
+        [JsonProperty("user_id")]
+        public long UserId { get; set; }
+
+        [JsonProperty("confirmation")]
+        public string Confirmation { get; set; } = Guid.NewGuid().ToString();
+
+        public Ping From(Message message) => new() {
+            ChatId = message.Chat.Id,
+            UserId = message.From!.Id
+        };
+    }
+}

CustomChatAddOns/Data/Pong.cs

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+using Kruzya.TelegramBot.Core.Attributes;
+using Newtonsoft.Json;
+
+namespace Kruzya.TelegramBot.CustomChatAddOns.Data
+{
+    [AllowedSerializableType("pong")]
+    public class Pong
+    {
+        [JsonProperty("confirmation")]
+        public string Confirmation { get; set; } = Guid.NewGuid().ToString();
+    }
+}