Added CommandHandler

tests/commands/StartCommand.php

@@ -0,0 +1,23 @@
+<?php
+
+    namespace commands;
+
+    use TgBotLib\Bot;
+    use TgBotLib\Exceptions\TelegramException;
+    use TgBotLib\Interfaces\CommandInterface;
+    use TgBotLib\Objects\Telegram\Update;
+
+    class StartCommand implements CommandInterface
+    {
+        /**
+         * @param Bot $bot
+         * @param Update $update
+         * @return void
+         * @throws TelegramException
+         */
+        public function handle(Bot $bot, Update $update): void
+        {
+            // reply to the incoming message
+            $bot->sendMessage($update->getMessage()->getChat()->getId(), 'Hello, ' . $update->getMessage()->getFrom()->getFirstName());
+        }
+    }