title: Add Telegram bot to group
body: <p>I'm in a one-to-one communication with my bot now he should post a button which prompts the user to select a chat. This works with:</p>
  
  <pre><code>InlineKeyboardButton selectGroup = new InlineKeyboardButton("Add to Group");
  selectGroup.SwitchInlineQuery = "test";
  selectGroup.CallbackData = null;
  selectGroup.Url = null;
  
  var keyboard = new InlineKeyboardMarkup(new[]
  {
      new[] // first row
      {
          selectGroup
      },
  });
  </code></pre>
  
  <p>Now the bot should be added to the selected chat. How can I accomplish that?</p>