Add keyboard suika15tone (#24947)

* Add keyboard suika15tone

* Update keyboards/suikagiken/suika15tone/keyboard.json

Co-authored-by: Drashna Jaelre <drashna@live.com>

---------

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/suikagiken/suika15tone/config.h

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+// Copyright 2025 @suikagiken
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+#define MIDI_ADVANCED

keyboards/suikagiken/suika15tone/keyboard.json

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+{
+    "manufacturer": "suikagiken",
+    "keyboard_name": "suika15tone",
+    "maintainer": "suikagiken",
+    "processor": "RP2040",
+    "bootloader": "rp2040",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "midi": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "cols": ["GP24", "GP0", "GP1", "GP2", "GP3", "GP4", "GP12", "GP13", "GP14"],
+        "rows": ["GP25", "GP23"]
+    },
+    "url": "https://github.com/suikagiken/suika15tone",
+    "usb": {
+        "device_version": "1.0.0",
+        "vid": "0x4B48",
+        "pid": "0x0301"
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0,   "y": 0},
+                {"matrix": [0, 1], "x": 2,   "y": 0},
+                {"matrix": [0, 2], "x": 3,   "y": 0},
+                {"matrix": [0, 4], "x": 5,   "y": 0},
+                {"matrix": [0, 5], "x": 6,   "y": 0},
+                {"matrix": [0, 6], "x": 7,   "y": 0},
+                {"matrix": [1, 0], "x": 0,   "y": 1},
+                {"matrix": [1, 1], "x": 1.5, "y": 1},
+                {"matrix": [1, 2], "x": 2.5, "y": 1},
+                {"matrix": [1, 3], "x": 3.5, "y": 1},
+                {"matrix": [1, 4], "x": 4.5, "y": 1},
+                {"matrix": [1, 5], "x": 5.5, "y": 1},
+                {"matrix": [1, 6], "x": 6.5, "y": 1},
+                {"matrix": [1, 7], "x": 7.5, "y": 1},
+                {"matrix": [1, 8], "x": 8.5, "y": 1}
+           ]
+        }
+    }
+}

keyboards/suikagiken/suika15tone/keymaps/default/keymap.json

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+{
+  "author": "suikagiken",
+  "keyboard": "suikagiken/suika15tone",
+  "keymap": "default",
+  "layout": "LAYOUT",
+  "layers": [
+    [
+        "KC_A",     "KC_D", "KC_F",         "KC_I", "KC_K", "KC_M",
+        "KC_B", "KC_C", "KC_E", "KC_G", "KC_H", "KC_J", "KC_L", "KC_N", "KC_O"
+    ]
+  ]
+}

keyboards/suikagiken/suika15tone/keymaps/midi/keymap.json

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+{
+  "author": "suikagiken",
+  "keyboard": "suikagiken/suika15tone",
+  "keymap": "midi",
+  "layout": "LAYOUT",
+  "layers": [
+    [
+        "MI_OCTU",    "MI_Cs1", "MI_Ds1",        "MI_Fs1", "MI_Gs1", "MI_As1",
+        "MI_OCTD", "MI_C1", "MI_D1", "MI_E1", "MI_F1", "MI_G1", "MI_A1", "MI_B1", "MI_C2"
+    ]
+  ]
+}

keyboards/suikagiken/suika15tone/readme.md

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+# suika15tone
+(English Follows Japanese)
+
+## 概要
+![suika15tone1](https://i.imgur.com/r0shhWR.jpg)
+![suika15tone2](https://i.imgur.com/7lCqpEX.jpg)
+
+suika15toneは1オクターブのピアノ鍵盤型マクロキーパッドです。
+通常のマクロキーパッドとしても使えるほか、MIDIキーボードとしてDAWソフトの入力や演奏に使用できます。
+
+* 制作 : すいか技研 （Website: https://suikagiken.net GitHub: [suikagiken](https://github.com/suikagiken) ）
+* 販売 : すいか技研の[booth](https://suikagiken.booth.pm/)にて販売予定です
+
+## ビルドガイド
+
+[こちら](https://github.com/suikagiken/suika15tone/blob/main/buildguide_1.0.md)からご覧下さい。
+
+---
+
+## Overview
+
+suika15tone is a 1-octave piano shaped macro keypad.
+You can use it as a normal macro keypad, or use it as a MIDI keyboard for DAW software input and musical performance.
+
+* Keyboard Maintainer: [suikagiken](https://github.com/suikagiken)
+* Hardware Availability: Available at [booth](https://suikagiken.booth.pm/).
+
+Make example for this keyboard (after setting up your build environment):
+
+    make suikagiken/suika15tone:default
+
+Flashing example for this keyboard:
+
+    make suikagiken/suika15tone: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 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