Add MCP23017 Scanner

Author: Neradoc

.gitmodules

@@ -316,6 +316,9 @@
 [submodule "libraries/drivers/mc3479"]
 	path = libraries/drivers/mc3479
 	url = https://github.com/jposada202020/CircuitPython_MC3479.git
+[submodule "libraries/helpers/mcp23017_scanner"]
+	path = libraries/helpers/mcp23017_scanner
+	url = https://github.com/Neradoc/CircuitPython_mcp23017_Scanner
 [submodule "libraries/helpers/displayio_listselect"]
 	path = libraries/helpers/displayio_listselect
 	url = https://github.com/FoamyGuy/CircuitPython_DisplayIO_ListSelect.git

circuitpython_community_library_list.md

@@ -110,6 +110,7 @@ Here is a listing of current CircuitPython Community Libraries. These libraries
 * [Jepler CircuitPython udecimal](https://github.com/jepler/Jepler_CircuitPython_udecimal.git) Reduced version of the decimal library for CircuitPython ([PyPi](https://pypi.org/project/jepler-circuitpython-udecimal)) \([Docs](https://jepler-udecimal.readthedocs.io/en/latest/))
 * [PiperBlocklyLibrary](https://github.com/buildwithpiper/PiperBlocklyLibrary.git) CircuitPython Library to support block-coding using the RP Pico microcontroller
 * [circuitPython dotstar featherwing](https://github.com/dastels/circuitPython_dotstar_featherwing.git) A higher level library for working with the DotStar FeatherWing, build on top of the CircuitPython DotStar driver \([Docs](https://circuitpython.readthedocs.io/projects/dotstar_featherwing/en/latest/))
+* [MCP23017 Scanner](https://github.com/Neradoc/CircuitPython_mcp23017_Scanner) A keypad-like module to scan keys or a key matrix connected to a MCP23017 GPIO expander ([Docs](https://mcp23017-matrix-scanner-for-circuitpython.readthedocs.io/))
 * [nonblocking timer](https://github.com/Angeleno-Tech/nonblocking_timer.git) nonblockingtimer is a class to simplify the use of time.monotonic() when working with CircuitPython \([Docs](https://circuitpython-nonblocking_timer.readthedocs.io/))
 * [nonblocking Serial Input](https://github.com/s-light/CircuitPython_nonblocking_serialinput) CircuitPython helper library to handle serial user input in an nonblocking way \([Docs](https://circuitpython-nonblocking-serialinput.readthedocs.io/))
 * [NVM Helper](https://github.com/FoamyGuy/Foamyguy_CircuitPython_nvm_helper) Easy interface to store and retrieve objects persisted via NVM \([Docs](https://circuitpython-nvm-helper.readthedocs.io/))