Add Coban Pad 12A (#25039)

Co-authored-by: jack <jack@pngu.org>

keyboards/coban/pad12a/config.h

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+// Copyright 2025 RyanDam (https://github.com/RyanDam)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 500U

keyboards/coban/pad12a/keyboard.json

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+{
+    "keyboard_name": "Coban Pad 12A",
+    "name": "Coban Pad 12A",
+    "url": "https://cobanstationery.com",
+    "maintainer": "Coban Stationery",
+    "manufacturer": "Coban Stationery",
+    "usb": {
+        "pid": "0xC12A",
+        "vid": "0xCB3A",
+        "device_version": "1.0.0"
+    },
+    "matrix_pins": {
+        "cols": ["GP18", "GP16", "GP11", "GP10"],
+        "rows": ["GP19", "GP17", "GP12"]
+    },
+    "diode_direction": "ROW2COL",
+    "encoder": {
+        "rotary": [
+            {"pin_a": "GP20", "pin_b": "GP21"}
+        ]
+    },
+    "processor": "RP2040",
+    "bootloader": "rp2040",
+    "features": {
+        "bootmagic": true,
+        "encoder": true,
+        "extrakey": true,
+        "mousekey": true
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0},
+                {"matrix": [0, 1], "x": 1, "y": 0},
+                {"matrix": [0, 2], "x": 2, "y": 0},
+                {"matrix": [0, 3], "x": 3, "y": 0},
+
+                {"matrix": [1, 0], "x": 0, "y": 1},
+                {"matrix": [1, 1], "x": 1, "y": 1},
+                {"matrix": [1, 2], "x": 2, "y": 1},
+                {"matrix": [1, 3], "x": 3, "y": 1},
+
+                {"matrix": [2, 0], "x": 0, "y": 2},
+                {"matrix": [2, 1], "x": 1, "y": 2},
+                {"matrix": [2, 2], "x": 2, "y": 2},
+                {"matrix": [2, 3], "x": 3, "y": 2}
+            ]
+        }
+    }
+}

keyboards/coban/pad12a/keymaps/default/keymap.c

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+// Copyright 2025 RyanDam (https://github.com/RyanDam)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT(
+    KC_MPLY,   KC_MPRV,   KC_MUTE,   KC_MNXT,
+    KC_PGUP,   KC_ESC,    KC_UP,     KC_ENT,
+    KC_PGDN,   KC_LEFT,   KC_DOWN,   KC_RIGHT
+  ),
+};
+
+
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS] = {
+    [0] = { ENCODER_CCW_CW(KC_VOLD, KC_VOLU) },
+};
+#endif

keyboards/coban/pad12a/keymaps/default/rules.mk

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+ENCODER_MAP_ENABLE = yes

keyboards/coban/pad12a/readme.md

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+# Coban Pad 12A
+
+![Coban Pad 12A](https://i.imgur.com/PTIaQld.jpeg)
+Small ortho keyboard with 11 hotswapable buttons and 1 encoder
+
+* Keyboard Maintainer: [RyanDam](https://github.com/RyanDam)  
+* Hardware Supported: Coban Pad 12A
+
+Make example for this keyboard (after setting up your build environment):
+
+    make coban/pad12a:default
+
+Flashing example for this keyboard:
+
+    make coban/pad12a: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:
+
+* **boot button**: Hold the BOOT button on the back of the PCB while plug in usb cable