Add submission # 6446

#6446

Author: ArduinoBot

registry.txt

@@ -8217,3 +8217,4 @@ https://github.com/regimantas/ChaCha32Arduino.git|Contributed|ChaCha32
 https://github.com/aikopras/AP_DCC_Decoder_Core.git|Contributed|AP_DCC_Decoder_Core
 https://github.com/regimantas/PY32LowPower.git|Contributed|PY32LowPower
 https://github.com/bahr1k/esp-arduino-tunnel.git|Contributed|EspTunnel
+https://github.com/RobTillaart/AD7390.git|Contributed|AD7390