[Keyboard] Adding Little Alby the Arduino Keyboard (#10713)

* Adding little Alby keyboard

* Adding readme and expanding programs

* Updating readme

* adding spirit guide

* changes based on review

* Updating config name and readme

* Update keyboards/littlealby/mute/rules.mk

Update tabbing

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/littlealby/mute/rules.mk

Remove other boards

Co-authored-by: Ryan <fauxpark@gmail.com>

* Changes based on review

* Update keyboards/littlealby/mute/config.h

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/littlealby/mute/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/littlealby/readme.md

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/littlealby/readme.md

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/littlealby/mute/config.h

Co-authored-by: Ryan <fauxpark@gmail.com>

* Adding unique vendor and Product IDs

* Update keyboards/littlealby/mute/config.h

Co-authored-by: Ryan <fauxpark@gmail.com>

* 0x4D55 = MU

* Adding default map

Co-authored-by: Alby Barber <albybarber@gmail.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/littlealby/mute/rules.mk

@@ -0,0 +1,22 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = caterina
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output