[Keyboard] Add Fine!40 PCB Support (#17426)

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

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+# Fine!40 PCB (For Mochi40)
+
+![aidansmithdotdev/fine40](https://i.imgur.com/2JMorvxh.png)
+
+The PCB for the Mochi40, a spiritual successor to the unreleased Whimsy recreated from scratch and made completely open source! With an OLED, Rotary Encoder, and headers for both the Elite-C and Nice!Nano, this board gives you all you could want in a 40%.
+
+* Keyboard Maintainer: [Aidan Smith](https://github.com/Aidan-OS)
+* Hardware Supported: Fine!40
+* Hardware Availability: https://github.com/Aidan-OS/Mochi40
+
+Make example for this keyboard (after setting up your build environment):
+
+    make aidansmithdotdev/fine40:default
+
+Flashing example for this keyboard:
+
+    make aidansmithdotdev/fine40: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 (top left key) 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