[Keyboard] Add Scotto9 handwired macropad (qmk#21105)

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

keyboards/handwired/scottokeebs/scotto9/info.json

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+{
+    "manufacturer": "ScottoKeebs",
+    "keyboard_name": "Scotto9",
+    "maintainer": "joe-scotto",
+    "diode_direction": "COL2ROW",
+    "development_board": "promicro",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        // 4, 5, 6
+        "cols": ["D4", "C6", "D7"],
+        // 15, 14, 16
+        "rows": ["B1", "B3", "B2"]
+    },
+    "url": "https://scottokeebs.com",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0003",
+        "vid": "0x534B"
+    },
+    "community_layouts": ["ortho_3x3"],
+    "layouts": {
+        "LAYOUT_ortho_3x3": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0},
+                {"matrix": [0, 1], "x": 1, "y": 0},
+                {"matrix": [0, 2], "x": 2, "y": 0},
+
+                // Row 2
+                {"matrix": [1, 0], "x": 0, "y": 1},
+                {"matrix": [1, 1], "x": 1, "y": 1},
+                {"matrix": [1, 2], "x": 2, "y": 1},
+
+                // Row 3
+                {"matrix": [2, 0], "x": 0, "y": 2},
+                {"matrix": [2, 1], "x": 1, "y": 2},
+                {"matrix": [2, 2], "x": 2, "y": 2}
+            ]
+        }
+    }
+}

keyboards/handwired/scottokeebs/scotto9/keymaps/default/keymap.c

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+/*
+Copyright 2022 Joe Scotto
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include QMK_KEYBOARD_H
+
+// Keymap
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT_ortho_3x3(
+        KC_1, KC_2, KC_3,
+        KC_4, KC_5, KC_6,
+        KC_7, KC_8, KC_9
+    )
+};

keyboards/handwired/scottokeebs/scotto9/readme.md

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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

keyboards/handwired/scottokeebs/scotto9/rules.mk

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+# This file intentionally left blank