[Keyboard] Add AkemiPad (#18790)

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

keyboards/adpenrose/akemipad/keymaps/oled_bongocat/readme.md

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+# The Bongo Cat VIA-compatible keymap for the AkemiPad
+
+# Features
+- Audio Click capabilitiy.
+- RGB Matrix Lighting (cycles left-right and up-down).
+- LEDs turn on and off depending on the layout selected on the VIA UI.
+- Encoder Map feature.
+- Bongo Cat animation with WPM counter and Caps Lock/Num Lock indicators.
+
+This keymap is optimized for a numpad and can fit the RGB matrix (with 
+very few animations due to AVR constraints), the encoder map, the audio 
+click feature and the display of the OLED animations. This was possible 
+thanks to the [squeez-o](https://github.com/nullbitsco/squeez-o) compression tool.
+
+![Bongo Cat](https://i.imgur.com/Ty0qKnV.gif)
+
+___
+
+###### *This keymap is an adaptation designed to work with the AkemiPad. The reference keymap used was created for the Nibble keyboard, and you can check it [here](https://github.com/qmk/qmk_firmware/tree/master/keyboards/nullbitsco/nibble/keymaps/oled_bongocat).*