[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>

keyboards/handwired/scottokeebs/scotto9/info.json

@@ -0,0 +1,47 @@
+{
+    "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}
+            ]
+        }
+    }
+}