Update Community_IRC.md (#413)

docs/Community_IRC.md

@@ -39,6 +39,7 @@ Forums registration terms and rules apply for our chats: [https://forum.armbian.
 ## 💬 Channels
 
 - **`#armbian`** is the project's main channel. Issue tracking, peer-to-peer user support or [upcoming release planning talks](https://docs.armbian.com/Process_Release-Model/#release-planning).
+- **`#armbian-announcements`** : important messages from the Armbian team. You definitely want to idle here. Moderated channel.
 - **`#armbian-devel`** : build engine development topics
 - **`#armbian-desktop`** : desktop environment development
 - **`#armbian-csc`** unsupported/deprecated board talk