Merge pull request #4098 from shaedrich/telegram

Add created_by and related to topic "Telegram"

topics/telegram/index.md

@@ -1,6 +1,6 @@
 ---
 aliases: telegram-client, telegram-bot, telegram-api
-created_by: Telegram Messenger LLP
+created_by: Telegram Messenger LLP, Telegram FZ LLC, Telegram Messenger Inc., Nikolai Durov, Pavel Durov
 display_name: Telegram
 github_url: https://github.com/TelegramMessenger
 logo: telegram.png
@@ -9,5 +9,6 @@ short_description: Telegram is a non-profit, cloud-based instant messaging servi
 topic: telegram
 url: https://telegram.org/
 wikipedia_url: https://en.wikipedia.org/wiki/Telegram_(messaging_service)
+related: whatsapp, threema, instant-messaging, open-source, mtproto, wechat, imessage
 ---
-Telegram is a cloud-based instant messaging service. It offers open source clients [for a multitude of operating systems](https://telegram.org/apps) and powerful APIs that allow developers to create their [own clients](https://core.telegram.org/api#telegram-api) and [chat bots](https://core.telegram.org/bots).
+**Telegram** is a cloud-based instant messaging service. It offers open source clients [for a multitude of operating systems](https://telegram.org/apps) and powerful APIs that allow developers to create their [own clients](https://core.telegram.org/api#telegram-api) and [chat bots](https://core.telegram.org/bots).