[Keyboard] add phantagom/baragon marcopad (#20543)

Co-authored-by: Pablo Martínez <58857054+elpekenin@users.noreply.github.com>
Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Tom Barnes <barnestom@me.com>

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+# phantagom/baragon
+
+[Baragon](https://en.wikipedia.org/wiki/Baragon) is a fictional monster, or kaiju, which first appeared in Ishirō Honda's 1965 film Frankenstein vs. Baragon.
+
+![phantagom/baragon](https://i.imgur.com/17RkGUPh.jpeg)
+
+A macro pad, 3x3 with rgb ring and rotary encoder, via compatible. Keys can be rotated, so macropad is usable at different angles.
+
+* Keyboard Maintainer: [Dennis Kruyt](https://github.com/dkruyt)
+* Project page: [baragon](https://github.com/dkruyt/mk/tree/main/baragon)
+* Hardware Supported: *RP2040-Zero*
+
+Make example for this keyboard (after setting up your build environment):
+
+    make phantagom/baragon:default
+
+Flashing example for this keyboard:
+
+    Copy the uf2 file to the rp2040 
+
+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 mode  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 top of the PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available