[Keyboard] Add Scotto9 handwired macropad (#21105)

Co-authored-by: Albert Y <76888457+filterpaper@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

1 files changed, 27 insertions, 0 deletions

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+# Scotto9
+
+![Scotto9](https://i.imgur.com/inbmNSEh.jpeg)
+
+A 9-key macropad. Case files available [here](https://github.com/joe-scotto/scottokeebs).
+
+*   Keyboard Maintainer: [Joe Scotto](https://github.com/joe-scotto)
+*   Hardware Supported: ATmega32U4
+*   Hardware Availability: [Amazon](https://amazon.com)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/scottokeebs/scotto9:default
+
+Flashing example for this keyboard:
+
+    make handwired/scottokeebs/scotto9: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
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