Ajout d'info sur l'usage de VNC

README-en.md

@@ -74,6 +74,10 @@ To use `-Vnc`, extract `tools/uvnc.zip` into the parent folder of `DeployCenter`
 └── uvnc/
 ```
 
+The supplied configuration encrypts the VNC connection with the SecureVNC plugin (`UseDSMPlugin=1`). The UltraVNC client must also enable this plugin and use `SecureVNCPlugin64.dsm`. To connect without encryption, disable the plugin on the client or set `UseDSMPlugin=0` in `uvnc/ultravnc.ini` before starting DeployCenter.
+
+![UltraVNC client configured with the SecureVNC plugin enabled](Images/Uvnc%20client.webp)
+
 ## Interactive deployment
 
 ![DeployCenter main screen](Images/main.webp)