Added the class MenuButton and the methods setChatMenuButton and getChatMenuButton for managing the behavior of the bot's menu button in private chats.

Author: TiiFuchs

src/Entities/MenuButton/MenuButton.php

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+<?php
+
+namespace Longman\TelegramBot\Entities\MenuButton;
+
+use Longman\TelegramBot\Entities\Entity;
+
+abstract class MenuButton extends Entity
+{
+
+}

src/Entities/MenuButton/MenuButtonCommands.php

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+<?php
+
+namespace Longman\TelegramBot\Entities\MenuButton;
+
+/**
+ * Represents a menu button, which opens the bot's list of commands.
+ */
+class MenuButtonCommands extends MenuButton
+{
+    public function __construct(array $data)
+    {
+        $data['type'] = 'commands';
+        parent::__construct($data);
+    }
+}

src/Entities/MenuButton/MenuButtonDefault.php

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+<?php
+
+namespace Longman\TelegramBot\Entities\MenuButton;
+
+/**
+ * Describes that no specific value for the menu button was set.
+ */
+class MenuButtonDefault extends MenuButton
+{
+    public function __construct(array $data)
+    {
+        $data['type'] = 'default';
+        parent::__construct($data);
+    }
+}

src/Entities/MenuButton/MenuButtonWebApp.php

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+<?php
+
+namespace Longman\TelegramBot\Entities\MenuButton;
+
+use Longman\TelegramBot\Entities\WebAppInfo;
+
+/**
+ * Represents a menu button, which launches a Web App.
+ *
+ * @method string     getText()   Text on the button
+ * @method WebAppInfo getWebApp() Description of the Web App that will be launched when the user presses the button. The Web App will be able to send an arbitrary message on behalf of the user using the method answerWebAppQuery.
+ *
+ * @method $this setText(string $text)          Text on the button
+ * @method $this setWebApp(WebAppInfo $web_app) Description of the Web App that will be launched when the user presses the button. The Web App will be able to send an arbitrary message on behalf of the user using the method answerWebAppQuery.
+ */
+class MenuButtonWebApp extends MenuButton
+{
+    public function __construct(array $data)
+    {
+        $data['type'] = 'web_app';
+        parent::__construct($data);
+    }
+
+    protected function subEntities(): array
+    {
+        return [
+            'web_app' => WebAppInfo::class,
+        ];
+    }
+
+
+}