[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/readme.md

@@ -0,0 +1,32 @@
+# The Kudox Full keyboard
+
+![Kudox logo](https://raw.githubusercontent.com/kumaokobo/kudox-keyboard/master/img/kudox.png)
+
+![Kudox Full image2](https://raw.githubusercontent.com/kumaokobo/kudox-keyboard/master/img/kudox-full-image2.jpg) | ![Kudox Full image1](https://raw.githubusercontent.com/kumaokobo/kudox-keyboard/master/img/kudox-full-image1.jpg)
+:----:|:-----:
+ front | angle
+
+- Keyboard Maintainer: [Kumao Kobo](https://github.com/kumaokobo)
+- Hardware Supported: Kudox Full PCB rev1.0 w/ Pro Micro
+- Assembly guide: [Kudox Full/README](https://github.com/kumaokobo/kudox-keyboard/blob/master/kudox-full/README.md)
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
+
+## Building Firmware
+
+Make example for this keyboard (after setting up your build environment):
+
+    make kudox_full/rev1:default
+
+
+Flashing example for this keyboard:
+
+    make kudox_full/rev1:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).