[Keyboard] Add Singa Kohaku (#24309)

Co-authored-by: jack <jack@pngu.org>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/zeix/singa/kohaku/config.h

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+/*
+Copyright 2023 zeix (@itsme-zeix)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 500U

keyboards/zeix/singa/kohaku/keymaps/default/keymap.c

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+/*
+Copyright 2024 zeix (@itsme-zeix)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+[0] = LAYOUT_all(
+  KC_ESC,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSLS, KC_BSPC, KC_INS,
+  KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS, KC_PGUP,
+  KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,  KC_PGDN,
+  KC_LSFT, KC_NUBS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT, KC_UP,   MO(1),
+  KC_LCTL, KC_LGUI, KC_LALT,          KC_SPC,           KC_SPC,           KC_SPC,           KC_RALT, KC_RCTL, KC_LEFT, KC_DOWN, KC_RIGHT
+  ),
+  
+[1] = LAYOUT_all(
+  KC_TRNS, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_TRNS, KC_DEL, KC_TRNS,
+  KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+  KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+  KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+  KC_TRNS, KC_TRNS, KC_TRNS,          KC_TRNS,          KC_TRNS,          KC_TRNS,          KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+  ),
+};

keyboards/zeix/singa/kohaku/matrix_diagram.md

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+# Matrix Diagram for Singa Kohaku (Designed by Zeix)
+
+```
+                                                    ┌───┬───┐
+                                    Split Backspace │16 │07 │
+                                                    └───┴───┘
+┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┬───┐
+│00 │10 │01 │11 │02 │12 │03 │13 │04 │14 │05 │15 │06 │07     │17 │
+├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┼───┤      ┌─────┐
+│20   │30 │21 │31 │22 │32 │23 │33 │24 │34 │25 │35 │26 │36   │37 │      │     │
+├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┼───┤   ┌──┴┐56  │ ISO Enter
+│40    │50 │41 │51 │42 │52 │43 │53 │44 │54 │45 │55 │56      │57 │   │46 │    │
+├──────┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┼───┤   └───┴────┘
+│60      │61 │71 │62 │72 │63 │73 │64 │74 │65 │75 │66    │76 │77 │
+├─────┬──┴┬──┴──┬┴───┴───┴───┴───┴───┴───┴──┬┴───┴┬─┬───┼───┼───┤
+│80   │90 │81   │83                         │95   │ │86 │96 │97 │
+└─────┴───┴─────┴───────────────────────────┴─────┘ └───┴───┴───┘
+┌────┬───┐
+│60  │70 │ Split Left Shift
+└────┴───┘
+┌────┬────┬────┬────────────────────────┬────┬────┐
+│80  │90  │81  │83                      │85  │95  │ 6.25u
+└────┴────┴────┴────────────────────────┴────┴────┘
+┌────┬────┬────┬───────────┬────┬───────┬────┬────┐
+│80  │90  │81  │92         │83  │94     │85  │95  │ Split Space (Left 2.75u)
+└────┴────┴────┴───────────┴────┴───────┴────┴────┘
+┌────┬────┬────┬───────┬────┬───────────┬────┬────┐
+│80  │90  │81  │92     │83  │94         │85  │95  │ Split Space (Left 2.25u)
+└────┴────┴────┴───────┴────┴───────────┴────┴────┘
+```

keyboards/zeix/singa/kohaku/readme.md

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+# SINGA Kohaku R2 (PCB designed by Zeix)
+
+![Layout Compatibility](https://i.imgur.com/2RaSZxG.png)
+
+65% PCB designed to support Kohaku R2.
+
+-   Keyboard Maintainer: [Zeix](https://github.com/itsme-zeix)
+-   Hardware Supported: Singa Kohaku R2 (PCB designed by Zeix)
+-   Hardware Availability: https://singakbd.com/
+
+Make example for this keyboard (after setting up your build environment):
+
+    make zeix/singa/kohaku:default
+
+Flashing example for this keyboard:
+
+    make zeix/singa/kohaku: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 top left key and plug in the keyboard.
+-   **Physical reset button**: Briefly press the `RESET` button twice or short the 'USB_BOOT' and `GND` pads and plug in the keyboard.
+-   **Keycode in layout**: Press the key mapped to `QK_BOOT`.