Adding USB serial.

Author: kattni

PMS5003_Air_Quality_Sensor/PMS5003_CircuitPython/code.py renamed to PMS5003_Air_Quality_Sensor/PMS5003_CircuitPython/PMS5003_example.py

@@ -13,6 +13,10 @@
 # import serial
 # uart = serial.Serial("/dev/ttyS0", baudrate=9600, timeout=0.25)
 
+# For use with USB-to-serial cable:
+# import serial
+# uart = serial.Serial("/dev/ttyUSB0", baudrate=9600, timeout=0.25)
+
 buffer = []
 
 while True: