Adding AXP2101 driver library

Author: CDarius

.gitmodules

@@ -448,3 +448,6 @@
 [submodule "libraries/drivers/mcp48xx"]
 	path = libraries/drivers/mcp48xx
 	url = https://github.com/brushmate/CircuitPython_MCP48XX.git
+[submodule "libraries/driver/axp2101"]
+	path = libraries/driver/axp2101
+	url = https://github.com/CDarius/CircuitPython_AXP2101.git

circuitpython_community_library_list.md

@@ -13,6 +13,7 @@ Here is a listing of current CircuitPython Community Libraries. These libraries
 * [CircuitPython_AD9833](https://github.com/CedarGroveStudios/CircuitPython_AD9833.git) A driver for the AD9833 Programmable Waveform Generator. \([Docs](https://github.com/CedarGroveStudios/CircuitPython_AD9833/blob/master/media/pseudo_readthedocs_cedargrove_ad9833.pdf))
 * [CircuitPython AS3935](https://github.com/BiffoBear/CircuitPython_AS3935.git) Library for the Franklin AS3935 lightning detector. The driver supports connections via SPI and I2C. \([Docs](https://circuitpython-as3935.readthedocs.io/))
 * [CircuitPython AXP192](https://github.com/CDarius/CircuitPython_AXP192.git) A driver for AXP192 power management IC. \([Docs](https://circuitpython-axp192.readthedocs.io/))
+* [CircuitPython AXP2101](https://github.com/CDarius/CircuitPython_AXP2101.git) A driver for AXP2101 power management IC. \([Docs](http://circuitpython-driver-for-axp2101-power-management-ic.readthedocs.io//))
 * [CircuitPython BMA220](https://github.com/jposada202020/CircuitPython_BMA220.git) Driver for the Bosch BMA220 Sensor ([PyPi](https://pypi.org/project/circuitpython-bma220/)) \([Docs](https://circuitpython-bma220.readthedocs.io/en/latest/))
 * [CircuitPython BMA400](https://github.com/jposada202020/CircuitPython_BMA400.git) Driver for the Bosch BMA400 Sensor ([PyPi](https://pypi.org/project/circuitpython-bma400/)) \([Docs](https://circuitpython-bma400.readthedocs.io/en/latest/))
 * [CircuitPython BMA423](https://github.com/jposada202020/CircuitPython_BMA423.git) Driver for the Bosch BMA423 Sensor ([PyPi](https://pypi.org/project/circuitpython-bma423/)) \([Docs](https://circuitpython-bma423.readthedocs.io/en/latest/))