Add submission # 6518

#6518

Author: ArduinoBot

registry.txt

@@ -8263,3 +8263,4 @@ https://github.com/lukdog/BleValueSync.git|Contributed|BleValueSync
 https://github.com/GyverLibs/RGBLED.git|Contributed|RGBLED
 https://github.com/mikeedudee/MS5611-Mike-Refactored.git|Contributed|MS5611 Library Mike Refactored
 https://github.com/TheBlackSwitch/PS2Keyboard.git|Contributed|PS2KEyboard
+https://github.com/SNP-FIT/ampify-soil-moisture-sensor.git|Contributed|AmpifySoilMoisture