[DOCS] Add webUI warning (#1637)

* [DOCS] Add webUI warning

* Update webui.md

---------

Co-authored-by: Northern Man <19808920+NorthernMan54@users.noreply.github.com>

docs/use/webui.md

@@ -12,6 +12,10 @@ For ESP32 based environments a WebUI is available to provide basic configuration
 
 By default access to the WebUI uses basic authentication to control access to your OpenMQTTGateway Device.  The login is `admin` and the password is your ota_password.
 
+::: warning
+The communication with the WEBUI is not encrypted, which means that your data may be visible on your local network.
+:::
+
 # Configuration Options
 
 ## Wifi
@@ -46,4 +50,4 @@ Ability to inject commands to OpenMQTTGateway for processing.  The commands acce
 
 `commands/MQTTtoSYS/config {"cmd":"restart"}`
 
-This works for all modules in your environment.
+This works for all modules in your environment.