Update clamui.md (#137)

update description and add screenshot

Author: shuvashish76

apps/clamui.md

@@ -1,8 +1,17 @@
 # CLAMUI
 
- ClamAV Desktop application (GUI).
+ ClamUI is a modern Linux desktop application that provides a user-friendly graphical interface for the ClamAV antivirus command-line tool. Built with GTK4 and libadwaita for a native GNOME appearance.
+ 
+ Features:
+ - Select files or directories to scan using the native file dialog
+ - Background scanning keeps the UI responsive during long scans
+ - Clear, readable display of scan results
+ - Graceful handling when ClamAV is not installed
+ - Modern Adwaita styling with proper GNOME integration
+ 
+ <a href="https://github.com/linx-systems/clamui/blob/master/screenshots/main_view.png"><img src="https://github.com/linx-systems/clamui/blob/master/screenshots/main_view.png" alt="" width="800px"></a>
 
  SITE/SOURCE: https://github.com/linx-systems/clamui
 
  | [Applications](https://portable-linux-apps.github.io/apps.html) | [Home](https://portable-linux-apps.github.io)
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