[Keyboard] Add Kudox Full (#15256)

* Add Kudox Full keyboard

* Add keyboards/kudox_full SPDX identifier

* Modify rule.mk of keyboards/kudox_full

* Remove html code from README of keyboards/kudox_full

* Modify readme of keyboards/kudox_full

* rev1.c includes rev1.h - kudox-full/rev1

* Move to <keyboard>.c oled_task_user and eeconfig_init_user

* Move post_config.h MOUSEKEY_*

* Change BOOTMAGIC_ENABLE no kudox_full

* Modify the obsoleted codes

* Modify eeconfig_init_kb from eeconfig_init_user

* Set none as default, but values

* Add about the bootloader on kudox_full/readme

* Modify the comments in keyboards/kudox_full/rules.mk

keyboards/kudox_full/rules.mk

@@ -0,0 +1,24 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = caterina
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+UNICODE_ENABLE = yes        # Unicode
+
+SPLIT_KEYBOARD = yes
+
+DEFAULT_FOLDER = kudox_full/rev1