Add madjax_macropad keyboard (#24524)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/madjax_macropad/keyboard.json

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+{
+    "manufacturer": "MadJax",
+    "keyboard_name": "madjax_macropad",
+    "maintainer": "guidoism",
+    "bootloader": "rp2040",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "encoder": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "cols": ["GP26", "GP27", "GP28", "GP29"],
+        "rows": ["GP6", "GP7", "GP0", "GP4", "GP3"]
+    },
+    "encoder": {
+        "rotary": [
+            {"pin_a": "GP1", "pin_b": "GP2"}
+        ]
+    },
+    "processor": "RP2040",
+    "url": "https://github.com/guidoism/madjax_macropad",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0000",
+        "vid": "0xFEED"
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"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},
+                {"matrix": [3, 0], "x": 0, "y": 3},
+                {"matrix": [3, 1], "x": 1, "y": 3},
+                {"matrix": [3, 2], "x": 2, "y": 3},
+                {"matrix": [3, 3], "x": 3, "y": 3},
+                {"matrix": [4, 0], "x": 0, "y": 4},
+                {"matrix": [4, 1], "x": 1, "y": 4},
+                {"matrix": [4, 2], "x": 2, "y": 4},
+                {"matrix": [4, 3], "x": 3, "y": 4}
+            ]
+        }
+    }
+}

keyboards/madjax_macropad/keymaps/default/keymap.c

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+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+enum custom_keycodes {
+    KC_P00 = SAFE_RANGE
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /*
+     *             ┌───┐
+     *             │ - │
+     * ┌───┬───┬───┼───┤
+     * │ 7 │ 8 │ 9 │ + │
+     * ├───┼───┼───┼───┤
+     * │ 4 │ 5 │ 6 │ % │
+     * ├───┼───┼───┼───┤
+     * │ 1 │ 2 │ 3 │ = │
+     * ├───┼───┼───┼───┤
+     * │ 0 │00 │ . │Ent│
+     * └───┴───┴───┴───┘
+     */
+    [0] = LAYOUT(
+                                   KC_PMNS,
+        KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
+        KC_P4,   KC_P5,   KC_P6,   KC_PERC,
+        KC_P1,   KC_P2,   KC_P3,   KC_EQL,
+        KC_P0,   KC_P00,  KC_PDOT, KC_PENT
+    )
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    if (record->event.pressed) {
+        switch(keycode) {
+            case KC_P00:
+                tap_code(KC_P0);
+                tap_code(KC_P0);
+                return false;
+        }
+    }
+    return true;
+}
+
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS] = {
+    [0] = { ENCODER_CCW_CW(KC_PGUP, KC_PGDN)  }
+};
+#endif

keyboards/madjax_macropad/keymaps/default/rules.mk

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+ENCODER_MAP_ENABLE = yes

keyboards/madjax_macropad/readme.md

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+# MadJax Macropad
+
+* Keyboard Maintainer: [Guido Bartolucci](https://github.com/guidoism)
+* Hardware Supported: Seeed Studio XIAO RP2040
+* Hardware Availability: https://github.com/guidoism/madjax_macropad
+
+Make example for this keyboard (after setting up your build environment):
+
+    make madjax_macropad:default
+
+Flashing example for this keyboard:
+
+    make madjax_macropad: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
+