Add CircuitPython Serial Controlled Servo library and documentation

Author: supcik

.gitmodules

@@ -493,3 +493,6 @@
 [submodule "libraries/helpers/pixel_mapper"]
 	path = libraries/helpers/pixel_mapper
 	url = https://github.com/clickonben/CircuitPython_pixel_mapper.git
+[submodule "libraries/drivers/sc_servo"]
+	path = libraries/drivers/sc_servo
+	url = https://github.com/supcik/CircuitPython_SerialControlledServo.git

circuitpython_community_library_list.md

@@ -47,6 +47,7 @@ Here is a listing of current CircuitPython Community Libraries. These libraries
 * [CircuitPython RuhRohRotaryIO](https://github.com/todbot/CircuitPython_RuhRohRotaryIO.git) CircuitPython library that pretents to be `rotaryio` for non-sequential pins ([PyPi](https://pypi.org/project/circuitpython-ruhrohrotaryio)) \([Docs](https://circuitpython-ruhrohrotaryio.readthedocs.io/en/latest/))
 * [CircuitPython SH1106](https://github.com/winneymj/CircuitPython_SH1106) CircuitPython driver for SH1106 OLED displays.
 * [CircuitPython Seeed XIAO nRF52840](https://github.com/furbrain/CircuitPython_seeed_xiao_nRF52840) Provides access to onboard sensors and battery charge management circuitry \([Docs](https://circuitpython-seeed-xiao-nrf52840.readthedocs.io/en/latest/))
+* [CircuitPython Serial Controlled Servo](https://github.com/supcik/CircuitPython_SerialControlledServo.git) CircuitPython driver for Serial Controlled Servo and Motor Controllers (SCSCL) using UART. \([PyPi](https://pypi.org/project/circuitpython-serial-controlled-servo/)) \([Docs](https://circuitpython-serial-controlled-servo.readthedocs.io/en/latest/))
 * [CircuitPython TCA9555](https://github.com/lesamouraipourpre/Community_CircuitPython_TCA9555) CircuitPython library for Texas Instruments TCA9555 Low-Voltage 16-Bit I2C and SMBus I/O Expander with Input / Output and Polarity Inversion. \([PyPI](https://pypi.org/project/community-circuitpython-tca9555/)) \([Docs](http://community-circuitpython-tca9555.rtfd.io/))
 * [CircuitPython TMP75](https://github.com/barbudor/CircuitPython_TMP75.git) CircuitPython driver library for Texas Instruments' TMP75 I2C temperature sensor \([Docs](https://circuitpython-tmp75.readthedocs.io/en/latest/))
 * [CircuitPython TicStepper](https://github.com/tekktrik/CircuitPython_TicStepper.git) Driver for the TIC stepper motor drivers \([Docs](https://circuitpython-ticstepper.readthedocs.io/en/latest/))