[Keyboard] Add Frooastboard Walnut (69% Keyboard) (#16743)

Co-authored-by: Ryan <fauxpark@gmail.com>

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+# Frooastboard Walnut
+
+![frooastboard/walnut](https://i.imgur.com/4erTDZqh.jpg)
+
+This is the Frooastboard Walnut keyboard. It is made of walnut wood, has 48 underglow LEDs and a solid aluminum base plate. It uses a USB Type-C connector and will likely be available for sale soon.
+
+* Keyboard Maintainer: [Frooastside](https://github.com/Frooastside)
+* Hardware Supported: Frooastboard Walnut
+* Hardware Availability: [Frooastboard Github](https://github.com/Frooastside/Frooastboard)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make frooastboard/walnut:default
+
+Flashing example for this keyboard:
+
+    make frooastboard/walnut: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).
+
+## 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