[Keyboard] Add minidivide (#19870)

Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/takashicompany/minidivide/readme.md

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+# miniDivide
+
+![miniDivide](https://i.imgur.com/x91x9yjh.jpg)
+
+miniDivide is a split keyboard with 0.8u (16mm) key pitch.
+The size of a single key is 80% of that of a conventional keyboard key.
+Although the key size is more compact than usual, it has the advantage of requiring minimal finger movement.
+The number of keys is 19 keys for one hand and 38 keys for two hands.
+
+It is small and thin, making it easy to carry around.
+The option to mount a coin cell battery on the PCB is available so that the BLE Micro Pro can be installed.
+OLED can also be mounted.
+
+miniDivideは0.8u(16mm)キーピッチの分割型のキーボードです。
+一つのキーの大きさが従来のキーボードのキーと比較すると80%のサイズとなっています。
+通常よりコンパクトなキーサイズですが、指の動きが最小限で済むという強みがあります。
+キー数は片手で19キー、両手で38キーとなります。
+
+小さく、薄いので持ち運びにも便利です。
+またBLE Micro Proを搭載できるよう、コイン電池をPCBに搭載するオプションが可能です。
+OLEDも搭載できます。
+
+* Keyboard Maintainer: [takashicompany](https://github.com/takashicompany)
+* Hardware Supported: PCB, Pro Micro
+* Hardware Availability: https://github.com/takashicompany/minidivide
+
+Make example for this keyboard (after setting up your build environment):
+
+    make takashicompany/minidivide:default
+
+Flashing example for this keyboard:
+
+    make takashicompany/minidivide: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 `QK_BOOT` if it is available