Add submission # 5995

#5995

Author: ArduinoBot

registry.txt

@@ -7926,3 +7926,4 @@ https://github.com/adafruit/Adafruit-DVI-HSTX.git|Recommended|Adafruit DVI HSTX
 https://github.com/christosneg/concurrentPID.git|Contributed|concurrentPID
 https://github.com/Mourty/ExtendedTime.git|Contributed|ExtendedTime
 https://github.com/Zeppelin500/MBusCom.git|Contributed|MBusCom
+https://github.com/sparkfun/SparkFun_Soil_Moisture_Arduino_Library.git|Contributed|SparkFun Soil Moisture Sensor