Update README.md

Add activity log feature description to README

Author: abhinavxd

README.md

@@ -35,6 +35,8 @@ Visit [libredesk.io](https://libredesk.io) for more info. Check out the [**Live
   Connect your favorite BI tools like Metabase and create custom dashboards and reports with your support data—without lock-ins.
 - **AI-Assisted Response Rewrite**  
   Instantly rewrite responses with AI to make them more friendly, professional, or polished.
+- **Activity logs**
+  Track all actions performed by agents and admins—updates and key events across the system—for auditing and accountability.
 - **Command Bar**  
   Opens with a simple shortcut (CTRL+k) and lets you quickly perform actions on conversations.