add lib, update drivers

Author: brentru

.gitmodules

@@ -766,3 +766,6 @@
 [submodule "libraries/drivers/sgp40"]
 	path = libraries/drivers/sgp40
 	url = https://github.com/adafruit/Adafruit_CircuitPython_SGP40.git
+[submodule "libraries/helpers/oauth_2"]
+	path = libraries/helpers/oauth_2
+	url = https://github.com/adafruit/Adafruit_CircuitPython_OAuth2.git

docs/drivers.rst

@@ -115,6 +115,8 @@ Helpers for interfacing with the internet, including IoT protocols.
     MiniMQTT <https://circuitpython.readthedocs.io/projects/minimqtt/en/latest/>
     NTP (Network time Protocol) <https://circuitpython.readthedocs.io/projects/ntp/en/latest/>
     Requests <https://circuitpython.readthedocs.io/projects/requests/en/latest/>
+    OAuth2.0 <https://circuitpython.readthedocs.io/projects/oauth2/en/latest/>
+
 
 Bluetooth Low Energy Helpers
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^