Add relic_menumanager helper library

.gitmodules

@@ -541,3 +541,6 @@
 [submodule "libraries/helpers/synthtools"]
 	path = libraries/helpers/synthtools
 	url = https://github.com/todbot/CircuitPython_SynthTools.git
+[submodule "libraries/helpers/menumanager"]
+	path = libraries/helpers/menumanager
+	url = https://github.com/relic-se/CircuitPython_MenuManager.git

circuitpython_community_library_list.md

@@ -127,6 +127,7 @@ Here is a listing of current CircuitPython Community Libraries. These libraries
 * [CircuitPython KeyManager](https://github.com/relic-se/CircuitPython_KeyManager) Helper library to manage notes in musical applications. Includes note priority, arpeggiation, and sequencing. ([Docs](https://circuitpython-keymanager.readthedocs.io/en/latest/))
 * [CircuitPython LeapYear](https://github.com/CedarGroveStudios/CircuitPython_LeapYear.git) Confirms whether a specified year is a leap year ([Docs](https://github.com/CedarGroveStudios/CircuitPython_LeapYear/blob/main/media/pseudo_rtd_cedargrove_leapyear.pdf))
 * [CircuitPython Mag Cal](https://github.com/furbrain/CircuitPython_mag_cal.git) Calibrate magnetic sensors ([Docs](https://circuitpython-mag-cal.readthedocs.io/en/latest/))
+* [CircuitPython MenuManager](https://github.com/relic-se/CircuitPython_MenuManager) Helper library which handles menu management for multiple action and data types and provides drivers for character lcd and displayio-compatible displays. ([Docs](https://circuitpython-menumanager.readthedocs.io/en/latest/))
 * [CircuitPython MicroOSC](https://github.com/todbot/CircuitPython_MicroOSC.git) ([PyPi](https://pypi.org/project/circuitpython-microosc)) ([Docs](https://circuitpython-microosc.readthedocs.io/en/latest/)) Minimal OSC parser and server for CircuitPython and CPython
 * [CircuitPython_MIDI_Tools](https://github.com/CedarGroveStudios/CircuitPython_MIDI_Tools.git) A collection of methods for processing MIDI notes and Control Change codes ([Docs](https://github.com/CedarGroveStudios/CircuitPython_MIDI_Tools/blob/main/media/pseudo_rtd_cedargrove_midi_tools.pdf))
 * [CircuitPython_MiniEthers](https://github.com/ShambaC/CircuitPython_MiniEthers) Circuitpython module for ethereum wallet creation and signing. ([PyPi](https://pypi.org/project/circuitpython-miniethers/)) ([Docs](https://circuitpython-miniethers.readthedocs.io/en/latest/))