Add link to HS300x library

Add a link to the Arduino_HS300x library in the humidity and temperature sensor library.

Author: rnowling

content/hardware/03.nano/boards/nano-33-ble-sense-rev2/tutorials/humidity-and-temperature-sensor/content.md

@@ -25,7 +25,7 @@ In this tutorial we will use an **Arduino Nano 33 BLE Sense Rev2** board to meas
 ## Goals
 The goals of this project are:
 - Learn how to output raw sensor data from the Arduino Nano 33 BLE Sense Rev2.
-- Use the HS300x library.
+- Use the [HS300x library](https://docs.arduino.cc/libraries/arduino_hs300x/).
 - Print temperature and humidity values in the Serial Monitor when they are within a certain range. 
 - Create your own temperature and humidity monitor.