[Keyboard] Add ScottoStarter Keyboard (#18626)

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

keyboards/handwired/jscotto/scottostarter/readme.md

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+# ScottoStarter
+
+![ScottoStarter](https://i.imgur.com/bspbVPah.jpg)
+
+A 52 key ortholinear keyboard that is designed to help transition you into smaller layouts. Case files available [here](https://github.com/joe-scotto/keyboards.git).
+
+-   Keyboard Maintainer: [Joe Scotto](https://github.com/joe-scotto)
+-   Hardware Supported: ATmega32U4
+-   Hardware Availability: [Amazon](https://amazon.com)
+
+# Compiling
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/jscotto/scottostarter:default
+
+Flashing example for this keyboard:
+
+    make handwired/jscotto/scottostarter:default
+
+# Bootloader
+
+Uses [bootmagic](https://github.com/qmk/qmk_firmware/blob/master/docs/feature_bootmagic.md) allowing you to hold the top left key (0, 0) when plugging the board in to enter bootloader mode.
+
+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).