Add submission # 839

#839

Author: ArduinoBot

registry.txt

@@ -4598,3 +4598,4 @@ https://github.com/mobizt/ESP-Google-Sheet-Client.git|Contributed|ESP-Google-She
 https://github.com/rodrigodornelles/3bc-lang.git|Contributed|3BC Language Virtual Machine
 https://github.com/ysard/TCS34725.git|Contributed|TCS34725 async
 https://github.com/adafruit/Adafruit_TestBed.git|Recommended|Adafruit TestBed
+https://github.com/GyverLibs/SimplePortal.git|Contributed|SimplePortal