Add Doio KB04 (#22754)

Co-authored-by: Joel Challis <git@zvecr.com>

1 files changed, 27 insertions, 0 deletions

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+# doio/kb04
+
+![doio/kb04](https://i.imgur.com/lqABZw4h.png)
+
+A macropad that have 4-key keyboard made by DOIO, which controlled by an APM32F103CBT6 chipset. The keyboard features per-key RGB and 1 encoder.
+
+* Keyboard Maintainer: [filmstarr](https://github.com/filmstarr)
+* Hardware Supported: DOIO Knob Board - KB04
+* Hardware Availability: [keebmonkey.com](https://www.keebmonkey.com/products/megalodon-macro-pad-with-a-knob)
+
+Make example for this keyboard (after setting up your build environment):
+
+    qmk compile -kb doio/kb04 -km default
+
+Flashing example for this keyboard:
+
+    qmk flash -kb doio/kb04 -km default
+
+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).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (1! key) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available