[Keyboard] musl/add-chiron-keyboard (#7146)

* Add the Chiron keyboard

* Add link to case repo

* Update keyboards/handwired/chiron/readme.md

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Update keyboards/handwired/chiron/keymaps/default/config.h

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/handwired/chiron/rules.mk

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/handwired/chiron/rules.mk

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/handwired/chiron/rules.mk

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/handwired/chiron/readme.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/handwired/chiron/rules.mk

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/handwired/chiron/rules.mk

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Clean up rules.mk for the configurator

keyboards/handwired/chiron/rules.mk

@@ -0,0 +1,38 @@
+# 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
+SPLIT_KEYBOARD = yes
+
+# Build Options
+#   change yes to no to disable
+#
+AUDIO_ENABLE = no
+AUTOLOG_ENABLE = no
+BACKLIGHT_ENABLE = no
+BLUETOOTH_ENABLE = no
+BOOTMAGIC_ENABLE = no
+COMMAND_ENABLE = no
+CONSOLE_ENABLE = no
+DEBUG_ENABLE = no
+EXTRAKEY_ENABLE = no
+FAUXCLICKY_ENABLE = no
+HD44780_ENABLE = no
+LEADER_ENABLE = no
+MIDI_ENABLE = no
+MOUSEKEY_ENABLE = yes
+NKRO_ENABLE = no
+RGBLIGHT_ENABLE = yes
+SLEEP_LED_ENABLE = yes
+TAP_DANCE_ENABLE = no
+UCIS_ENABLE = no
+UNICODEMAP_ENABLE = no
+UNICODE_ENABLE = no