[Keyboard] Add Boaty (#17378)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Jels02 <joah@Joah-Big-PC.localdomain>

keyboards/jels/boaty/readme.md

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+# Boaty
+
+![Boaty](https://i.imgur.com/6LEaYxSh.jpg)
+
+* Keyboard Maintainer: [jels](https://github.com/JoahNelson)
+* Hardware Supported: Boaty
+* Hardware Availabililty: Limited Group buy from: [jels](https://jels.au)
+
+Make example for this keyboard (after setting up your build environment):
+    
+    make jels/boaty:default
+    
+Flashing example for this keyboard:
+
+    make jels/boaty: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 leftmost key (ESC) and plug in the keyboard
+* **USBASPLoader**: Press down the BOOT switch and plug in the keyboard
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
+
+* **Exit Bootloader**: To exit the bootloader, press the RESET switch (Left of BOOT).