Add Zeropad (#24737)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Joel Challis <git@zvecr.com>

keyboards/handwired/zeropad/keyboard.json

@@ -0,0 +1,38 @@
+{
+    "manufacturer": "Leon Sieber",
+    "keyboard_name": "ZeroPad",
+    "maintainer": "diffrentGuesser",
+    "development_board": "promicro",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "cols": ["D1", "D0", "D4"],
+        "rows": ["C6", "D7", "E6"],
+    },
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0000",
+        "vid": "0x5A50"
+    },
+    "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},
+                {"matrix": [1, 0], "x": 0, "y": 1},
+                {"matrix": [1, 1], "x": 1, "y": 1},
+                {"matrix": [1, 2], "x": 2, "y": 1},
+                {"matrix": [2, 0], "x": 0, "y": 2},
+                {"matrix": [2, 1], "x": 1, "y": 2},
+                {"matrix": [2, 2], "x": 2, "y": 2}
+            ]
+        }
+    }
+}

keyboards/handwired/zeropad/keymaps/default/keymap.c

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+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+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/zeropad/readme.md

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+# ZeroPad
+
+![ZeroPad](https://i.imgur.com/KBkI4q1.jpeg)
+
+This keyboard is inspired by the scotto9 from Joe Scotto. This keyboard is compatible with via and has 4 layers of keybinds (24 keybinds - 4x8 + 1 per layer for changing the layer).
+
+* Keyboard Maintainer: [Leon Sieber](https://github.com/diffrentGuesser)
+* Hardware Supported: Pro Micro, 3 pin switches
+* Hardware Availability: [Pro Micro](https://de.aliexpress.com/item/32846843498.html?spm=a2g0o.cart.0.0.146d4ae4kCjqDY&mp=1&gatewayAdapt=glo2deu), [switches](https://de.aliexpress.com/item/1005007135709029.html?spm=a2g0o.cart.0.0.146d4ae4kCjqDY&mp=1&gatewayAdapt=glo2deu)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/zeropad:default
+
+Flashing example for this keyboard:
+
+    make handwired/zeropad: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 (the top left key) and plug in the keyboard 
+* **Physical reset**: Short the GND and the RST pins on the Pro Micro.
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available