added hackpad keyboard

keyboards/hackpad/info.json

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+{
+    "manufacturer": "Nico Stuhlmueller",
+    "keyboard_name": "hackpad",
+    "maintainer": "ThePurox",
+    "development_board": "promicro",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true,
+        "rgblight": true,
+        "encoder": true
+    },
+    "matrix_pins": {
+        "cols": ["B1", "B3", "B2", "B6"],
+        "rows": ["C6", "D7", "E6", "B4", "B5"]
+    },
+    "encoder": {
+        "rotary": [
+            {"pin_a": "F5", "pin_b": "F4"}
+        ]
+    },
+    "url": "https://git.imaginaerraum.de/Purox/Hackpad",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0000",
+        "vid": "0xFEED"
+    },
+    "ws2812": {
+        "pin": "D4"
+    },
+    "rgblight": {
+        "led_count": 16,
+        "sleep": true,
+        "animations": {
+            "breathing": true,
+            "rainbow_mood": true,
+            "rainbow_swirl": true,
+            "snake": true,
+            "knight": true,
+            "christmas": true,
+            "static_gradient": true,
+            "rgb_test": true,
+            "alternating": true,
+            "twinkle": true
+        }
+    },
+    "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/hackpad/keymaps/default/keymap.c

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+// Copyright 2023 Nico Stuhlmueller (@ThePurox)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+#include "keymap_german.h"
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /*             ┌───┐
+     *             │MUT│
+     * ┌───┬───┬───┼───┤
+     * │ 7 │ 8 │ 9 │ + │
+     * ├───┼───┼───┼───┤
+     * │ 4 │ 5 │ 6 │ - │
+     * ├───┼───┼───┼───┤
+     * │ 1 │ 2 │ 3 │ * │
+     * ├───┼───┼───┼───┤
+     * │ 0 │ . │Ent│ / │
+     * └───┴───┴───┴───┘
+     */
+    [0] = LAYOUT(                                 LT(1, KC_MUTE),
+                            KC_7, KC_8,   KC_9,   DE_PLUS,
+                            KC_4, KC_5,   KC_6,   DE_MINS,
+                            KC_1, KC_2,   KC_3,   DE_ASTR,
+                            KC_0, KC_DOT, KC_ENT, DE_SLSH),
+
+    [1] = LAYOUT(                                         XXXXXXX,
+                            RGB_M_P,  RGB_M_B,  RGB_M_R,  RGB_HUI,
+                            RGB_M_SW, RGB_M_SN, RGB_M_K,  RGB_HUD,
+                            RGB_M_X,  RGB_M_G,  RGB_M_TW, RGB_VAI,
+                            RGB_TOG,  RGB_SAI,  RGB_SAD,  RGB_VAD)};

keyboards/hackpad/readme.md

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+# hackpad
+
+![hackpad](https://git.imaginaerraum.de/Purox/Hackpad/raw/branch/main/assets/pic.jpg)
+
+
+The `Hackpad` is a 4x4 numpad/macropad designed for the Arduino Day 2023 in Bayreuth in cooperation with the hackspace [Imaginärraum e.V.](imaginaerraum.de) and [Fablab-Bayreuth e.V.](fablab-bayreuth.de).
+It supports 16 MX-style switches, an EC-11 rotary encoder, and per key RGB LEDs based on SK6812.
+
+In v0.2 all necessary components are through hole components (except for an optional reset switch and RGB-LEDs), but the ProMicro protrudes out of the case.
+In v0.3 this is fixed by moving some diodes to the bottom side. The bottom diodes however are SMD only.
+
+* Keyboard Maintainer: [Nico Stuhlmueller](https://github.com/ThePurox)
+* Hardware Supported: ProMicro is supported in v0.2 and v0.3 of the PCBs
+* Hardware Availability: PCBs can be found [here](https://git.imaginaerraum.de/Purox/Hackpad)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make hackpad:default
+
+Flashing example for this keyboard:
+
+    make hackpad: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 2 ways:
+
+* **Physical reset button**: Briefly press the button on the top 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

keyboards/hackpad/rules.mk

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+# this file is intentionally left blank