[Handwired] Support for Adafruit lemon keypad (#16395)

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

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+# lemonpad
+
+![lemonpad](https://i.imgur.com/hAp2Nich.jpeg)
+
+This is a QMK and VIA implementation for an atmega32u4 based adaptation of the Adafruit Lemon Keypad. By default it uses a Pro Micro, if you would like to use a different microcontroller please make sure you have the correct bootloader set. 
+
+* Keyboard Maintainer: [dari-studios](https://github.com/dari-studios)
+* Hardware Supported: atmega32u4 based boards with the Caterina bootloader
+* Hardware Availability: https://learn.adafruit.com/qtpy-lemon-mechanical-keypad-macropad
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/lemonpad:default
+
+Flashing example for this keyboard:
+
+    make handwired/lemonpad: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