Add MCP48XX driver

Author: brushmate

.gitmodules

@@ -445,3 +445,6 @@
 [submodule "libraries/helpers/ehttpserver"]
 	path = libraries/helpers/ehttpserver
 	url = https://github.com/bablokb/circuitpython-ehttpserver.git
+[submodule "libraries/drivers/mcp48xx"]
+	path = libraries/drivers/mcp48xx
+	url = https://github.com/brushmate/CircuitPython_MCP48XX.git

circuitpython_community_library_list.md

@@ -35,6 +35,7 @@ Here is a listing of current CircuitPython Community Libraries. These libraries
 * [CircuitPython LILYGO T-Deck](https://github.com/rgrizzell/CircuitPython_LILYGO_T-Deck.git) CircuitPython drivers for the LILYGO T-Deck peripherals. ([PyPi](https://pypi.org/project/circuitpython-lilygo-t-deck/)) \([Docs](https://circuitpython-lilygo-t-deck.readthedocs.io/en/latest/))
 * [CircuitPython LPS28DFW](https://github.com/jposada202020/CircuitPython_LPS28.git) Driver for Sparkfun LPS28DFW Sensor ([PyPi](https://pypi.org/project/circuitpython-lps28/) )\([Docs](https://circuitpython-lps28.readthedocs.io/en/latest/))
 * [CircuitPython MC3479](https://github.com/jposada202020/CircuitPython_MC3479.git) Driver for the Memsic MC3479 Accelerometer ([PyPi](https://pypi.org/project/circuitpython-mc3479/) )\([Docs](https://circuitpython-mc3479.readthedocs.io/en/latest/))
+* [CircuitPython MCP48XX](https://github.com/brushmate/CircuitPython_MCP48XX.git) Driver for the Microchip MCP4801, MCP4811, MCP4821, MCP4802, MCP4812, and MCP4822 digital to analog converters ([PyPi](https://pypi.org/project/circuitpython-mcp48xx/) )\([Docs](https://circuitpython-mcp48xx.readthedocs.io/en/latest/))
 * [CircuitPython MPU6886](https://github.com/jins-tkomoda/CircuitPython_MPU6886.git) Driver for the MPU6886 inertial measurement unit ([Docs](https://circuitpython-mpu6886.readthedocs.io/en/latest/))
 * [CircuitPython_NAU7802](https://github.com/CedarGroveStudios/CircuitPython_NAU7802.git) A driver for the NAU7802 24-bit ADC.
 * [CircuitPython PS2Controller](https://github.com/todbot/CircuitPython_PS2Controller.git) ([PyPi](https://pypi.org/project/circuitpython-ps2controller)) \([Docs](https://circuitpython-ps2controller.readthedocs.io/en/latest/)) CircuitPython library to read Sony PS2 game controllers