Update CHANGELOG.MD

CHANGELOG.MD

@@ -41,6 +41,8 @@ All notable changes to this project will be documented in this file.
   - New V3 Install Script 
 - **Plex Media Server LXC**
   - New V3 Install Script 
+- **Jellyfin Media Server LXC**
+  - New V3 Install Script 
 
 ## 2022-04-17