Adding CLUE.

Author: kattni

.gitmodules

@@ -625,3 +625,6 @@
 [submodule "libraries/drivers/dps310"]
 	path = libraries/drivers/dps310
 	url = https://github.com/adafruit/Adafruit_CircuitPython_DPS310.git
+[submodule "libraries/drivers/clue"]
+	path = libraries/drivers/clue
+	url = https://github.com/adafruit/Adafruit_CircuitPython_CLUE.git

docs/drivers.rst

@@ -27,7 +27,8 @@ specific boards.
 
 .. toctree::
 
-    Adafruit CircuitPlayground Express <https://circuitpython.readthedocs.io/projects/circuitplayground/en/latest/>
+    Adafruit CircuitPlayground <https://circuitpython.readthedocs.io/projects/circuitplayground/en/latest/>
+    Adafruit CLUE <https://circuitpython.readthedocs.io/projects/clue/en/latest/>
     Adafruit FeatherWings <https://circuitpython.readthedocs.io/projects/featherwing/en/latest/>
     PyBadger (PyBadge and PyGamer) <https://circuitpython.readthedocs.io/projects/pybadger/en/latest/>
     Adafruit PyPortal <https://circuitpython.readthedocs.io/projects/pyportal/en/latest/>