Add MAX1704X driver

Author: tekktrik

.gitmodules

@@ -902,3 +902,6 @@
 [submodule "libraries/drivers/ags02ma"]
 	path = libraries/drivers/ags02ma
 	url = https://github.com/adafruit/Adafruit_CircuitPython_AGS02MA.git
+[submodule "libraries/drivers/max1704x"]
+	path = libraries/drivers/max1704x
+	url = https://github.com/adafruit/Adafruit_CircuitPython_MAX1704x.git

docs/drivers.rst

@@ -508,6 +508,7 @@ Miscellaneous
     INA260 Current and Power Monitor <https://circuitpython.readthedocs.io/projects/ina260/en/latest/>
     LC709203F Fuel Gauge and Battery Monitor <https://circuitpython.readthedocs.io/projects/lc709203f/en/latest/>
     Matrix Keypad <https://circuitpython.readthedocs.io/projects/matrixkeypad/en/latest/>
+    MAX1704X Fuel Gauge <https://circuitpython.readthedocs.io/projects/max1704x/en/latest/>
     MAX9744 Audio Amplifier  <https://circuitpython.readthedocs.io/projects/max9744/en/latest/>
     MLX90640 Thermal Camera <https://circuitpython.readthedocs.io/projects/mlx90640/en/latest/>
     NeoTrellis 4x4 Keypad <https://circuitpython.readthedocs.io/projects/neotrellis/en/latest/>