Add https://github.com/mathieucarbou/MycilaDimmer (#6997)

Author: mathieucarbou

repositories.txt

@@ -4459,6 +4459,7 @@ https://github.com/Mathieu52/GPSP
 https://github.com/ESP32Async/AsyncTCP
 https://github.com/ESP32Async/ESPAsyncWebServer
 https://github.com/mathieucarbou/MycilaConfig
+https://github.com/mathieucarbou/MycilaDimmer
 https://github.com/mathieucarbou/MycilaDS18
 https://github.com/mathieucarbou/MycilaEasyDisplay
 https://github.com/mathieucarbou/MycilaESPConnect