Update README with screenshot

README.md

@@ -2,6 +2,8 @@
 
 A cross-platform (Linux/Windows) desktop application for viewing, creating, and editing Teletext pages. This tool is designed to work with the `.t42` file format, providing a robust environment for Teletext recovery and design.
 
+![Application Screenshot](screenshot.png)
+
 ## Features
 
 -   **File Support:** Load and save standard `.t42` Teletext data files.
@@ -43,4 +45,4 @@ The application is built using Python and PyQt6, and packaged into a standalone
     -   **Windows:** `dist/TeletextEditor_Windows.exe`
 
 > **Note for Cross-Compilation:**
-> The build script produces an executable for the **current OS** running the script. To build the Windows executable on Linux, you can use Wine (as configured in the Gitea workflow) or run the script natively on a Windows machine.
+> The build script produces an executable for the **current OS** running the script. To build the Windows executable on Linux, you can use Wine (as configured in the Gitea workflow) or run the script natively on a Windows machine.