[Keyboard] Abacus Keyboard ReMerge (#8308)

* added abacus keyboard

* keymap updates

* Update keyboards/abacus/config.h

* Update keyboards/abacus/config.h

* Update keyboards/abacus/keymaps/default/keymap.c

* Update keyboards/abacus/keymaps/default/keymap.c

* Update keyboards/abacus/keymaps/default/keymap.c

* start cleaning up for merge

* cleaned for merge

* cleaned

* cleaned

* Update keyboards/abacus/abacus.h

* Update keyboards/abacus/keymaps/default/keymap.c

* Update keyboards/abacus/keymaps/default/readme.md

* Update keyboards/abacus/readme.md

* Update keyboards/abacus/readme.md

* Update keyboards/abacus/rules.mk

* Update keyboards/abacus/info.json

* Update keyboards/abacus/info.json

* Update keyboards/abacus/info.json

* Update keyboards/abacus/readme.md

* Update keyboards/abacus/info.json

* Update keyboards/abacus/rules.mk

* Update keyboards/abacus/rules.mk

keyboards/abacus/rules.mk

@@ -0,0 +1,36 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   ATmega32A    bootloadHID
+#   ATmega328P   USBasp
+BOOTLOADER = atmel-dfu
+
+# 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 = yes        # Console for debug
+COMMAND_ENABLE = yes        # 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
+MIDI_ENABLE = no            # MIDI support
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = no           # Audio output on port C6
+FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
+HD44780_ENABLE = no         # Enable support for HD44780 based LCDs
+UNICODEMAP_ENABLE = yes
+ENCODER_ENABLE = yes
+DIP_SWITCH_ENABLE = yes
+LTO_ENABLE = yes