Add screenshots to README

- Web UI media player screenshot
- Media Browser screenshot
- Script and Callback Management screenshot

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -18,6 +18,8 @@ A REST API server for controlling system media playback on Windows, Linux, macOS
 
 The media server includes a built-in web interface for controlling and monitoring media playback.
 
+![Web UI](docs/web-ui.PNG)
+
 ### Features
 
 - **Real-time status updates** via WebSocket connection
@@ -93,6 +95,8 @@ See [CLAUDE.md](CLAUDE.md#internationalization-i18n) for detailed translation gu
 
 The Media Browser feature allows you to browse and play media files from configured folders directly through the Web UI.
 
+![Media Browser](docs/media-browser.PNG)
+
 ### Browser Features
 
 - **Folder Configuration** - Mount multiple media folders (music/video directories)
@@ -377,6 +381,8 @@ All control endpoints require authentication and return `{"success": true}` on s
 
 The server supports executing pre-defined scripts via API.
 
+![Script and Callback Management](docs/scripts-management.PNG)
+
 #### List Scripts
 
 ```