[Keyboard] Add Chouchou keyboard (#21699)

keyboards/chouchou/config.h

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+// Copyright 2023 Dane Lipscombe (@dlip)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 1000U

keyboards/chouchou/info.json

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+{
+    "manufacturer": "dlip",
+    "keyboard_name": "chouchou",
+    "maintainer": "dlip",
+    "bootloader": "rp2040",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": false,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "direct": [
+            ["GP0", "GP1", "GP2", "GP3", "GP4", "GP5", "GP6", "GP7", "GP8", "GP9", "GP10", "GP11", "GP12", "GP13", "GP14", "GP15", "GP26", "GP27", "GP28", "GP29"]
+        ]
+    },
+    "processor": "RP2040",
+    "url": "https://github.com/dlip/chouchou",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0117",
+        "vid": "0xFABE"
+    },
+    "layouts": {
+        "LAYOUT_split_2x4_2": {
+            "layout": [
+                {"matrix": [0, 16], "x": 0, "y": 0.88},
+                {"matrix": [0, 17], "x": 1, "y": 0.38},
+                {"matrix": [0, 18], "x": 2, "y": 0},
+                {"matrix": [0, 19], "x": 3, "y": 0.38},
+                {"matrix": [0, 0], "x": 4, "y": 0.38},
+                {"matrix": [0, 1], "x": 5, "y": 0},
+                {"matrix": [0, 2], "x": 6, "y": 0.38},
+                {"matrix": [0, 3], "x": 7, "y": 0.88},
+                {"matrix": [0, 12], "x": 0, "y": 1.88},
+                {"matrix": [0, 13], "x": 1, "y": 1.38},
+                {"matrix": [0, 14], "x": 2, "y": 1},
+                {"matrix": [0, 15], "x": 3, "y": 1.38},
+                {"matrix": [0, 4], "x": 4, "y": 1.38},
+                {"matrix": [0, 5], "x": 5, "y": 1},
+                {"matrix": [0, 6], "x": 6, "y": 1.38},
+                {"matrix": [0, 7], "x": 7, "y": 1.88},
+                {"matrix": [0, 11], "x": 2, "y": 2.38},
+                {"matrix": [0, 10], "x": 3, "y": 2.5},
+                {"matrix": [0, 9], "x": 4, "y": 2.5},
+                {"matrix": [0, 8], "x": 5, "y": 2.38}
+            ]
+        }
+    }
+}

keyboards/chouchou/keymaps/default/keymap.c

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+// Copyright 2023 Dane Lipscombe (@dlip)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT_split_2x4_2(
+        KC_A,         KC_B,      KC_C,         KC_D,            KC_N,       KC_M,        KC_L,      KC_K,
+        KC_E,         KC_F,      KC_G,         KC_H,            KC_R,       KC_Q,        KC_P,      KC_O,
+                                 KC_I,         KC_J,            KC_T,       KC_S
+    ),
+};

keyboards/chouchou/readme.md

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+# Chouchou
+
+![Chouchou](https://i.imgur.com/BYk2n5Ch.jpeg)
+
+Chouchou (Japanese for butterfly) is a minimalist unibody keyboard designed to be used with the [Taipo](https://inkeys.wiki/en/keymaps/taipo) layout.
+
+- [Github repo](https://github.com/dlip/chouchou)
+- Keyboard Maintainer: [Dane Lipscombe](https://github.com/dlip)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make chouchou:default
+
+Flashing example for this keyboard:
+
+    make chouchou: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