Add support for message reaction event handling

src/TgBotLib/Events/MessageReactionEvent.php

@@ -0,0 +1,31 @@
+<?php
+
+    namespace TgBotLib\Events;
+
+    use TgBotLib\Abstracts\UpdateEvent;
+    use TgBotLib\Bot;
+    use TgBotLib\Enums\UpdateEventType;
+    use TgBotLib\Objects\MessageReactionUpdated;
+
+    abstract class MessageReactionEvent extends UpdateEvent
+    {
+        /**
+         * @inheritDoc
+         */
+        public static function getEventType(): UpdateEventType
+        {
+            return UpdateEventType::MESSAGE_REACTION;
+        }
+
+        /**
+         * A reaction to a message was changed by a user. The bot must be an administrator in the chat and must
+         * explicitly specify "message_reaction" in the list of allowed_updates to receive these updates.
+         * The update isn't received for reactions set by bots.
+         *
+         * @return MessageReactionUpdated
+         */
+        protected function getMessageReactionUpdated(): MessageReactionUpdated
+        {
+            return $this->update->getMessageReaction();
+        }
+    }