[Keyboard] Add Kapl (#16255)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/kapl/readme.md

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+# Kapl Keyboard
+
+![Kapl Keyboard](https://i.imgur.com/XH8APgi.jpg)
+![Kapl PCB](https://i.imgur.com/uir2nQq.jpg)
+
+The Kapl is a split ergonomic keyboard with 70 keys (7x5).
+
+* Keyboard Maintainer: [keyzog](https://github.com/keyzog)
+* Hardware Supported: Kapl PCB / Pro Micro
+* Hardware Availability:  Order PCBs with gerber files from the [repository](https://github.com/keyzog/kapl/tree/main/gerbers)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make kapl/rev1:default
+
+Flashing example for this keyboard:
+
+    make kapl/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).
+
+## Bootloader
+
+Enter the bootloader in 2 ways:
+
+* **Physical reset button**: Briefly press the reset button on the PCB
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available