Add handwired/footy (#25151)

Co-authored-by: jack <jack@pngu.org>

keyboards/handwired/footy/config.h

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+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 500U

keyboards/handwired/footy/keyboard.json

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+{
+    "manufacturer": "CJ Pais",
+    "keyboard_name": "Footy",
+    "maintainer": "cjpais",
+    "bootloader": "rp2040",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true
+    },
+    "bootmagic": {
+        "matrix": [0, 1]
+    },
+    "matrix_pins": {
+        "cols": ["GP11", "GP10", "GP15"],
+        "rows": ["GP14"]
+    },
+    "processor": "RP2040",
+    "url": "https://workshop.cjpais.com/projects/footy",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0001",
+        "vid": "0x636A"
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0},
+                {"matrix": [0, 1], "x": 1, "y": 0},
+                {"matrix": [0, 2], "x": 2, "y": 0}
+            ]
+        }
+    }
+}

keyboards/handwired/footy/keymaps/default/keymap.json

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+{
+    "keyboard": "handwired/footy",
+    "keymap": "default",
+    "layout": "LAYOUT",
+    "layers": [
+       [
+        "KC_A", "KC_B", "KC_C"
+       ]
+    ]
+}

keyboards/handwired/footy/keymaps/handy/keymap.json

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+{
+    "keyboard": "handwired/footy",
+    "keymap": "handy",
+    "layout": "LAYOUT",
+    "layers": [
+       [
+        "KC_NO", "MT(MOD_RCTL | MOD_RGUI, KC_NO)", "KC_NO"
+       ]
+    ],
+    "config": {
+        "tapping": {
+            "term": 50
+        }
+    }
+}

keyboards/handwired/footy/keymaps/superwhisper/keymap.json

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+{
+    "keyboard": "handwired/footy",
+    "keymap": "superwhisper",
+    "layout": "LAYOUT",
+    "layers": [
+       [
+        "KC_NO", "LOPT(KC_SPACE)", "KC_NO"
+       ]
+    ],
+    "config": {
+        "tapping": {
+            "term": 50
+        }
+    }
+}

keyboards/handwired/footy/readme.md

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+# Footy
+
+![Footy Foot Pedal](https://i.imgur.com/ZdvlgRB.jpeg)
+
+*Footy is a foot pedal intended to be used with a speech to text application like 'handy' or superwhisper. Initially developed as an assistive technology device for those with limited typing abilities.*
+
+* Keyboard Maintainer: [CJ Pais](https://github.com/cjpais)
+* Hardware Supported: [Keebio Stampy](https://keeb.io/products/stampy-rp2040-usb-c-controller-board-for-handwiring)
+* Hardware Availability: [3D printed case](https://makerworld.com/en/models/1185240-footy)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/footy:default
+
+Flashing example for this keyboard (enter the bootloader first):
+
+    make handwired/footy:default:flash
+    
+or drag and drop .uf2 file on the removable storage
+
+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:
+
+* **Physical reset button**: Briefly double press the button on the back of the PCB
+
+## Keymaps
+
+Right now there are two primary keymaps, one for 'handy' and one for 'superwhisper'.
+
+Handy's default keymap is for the center switch to be RCTRL + RGUI.
+
+Superwhisper's default keymap is for the center switch to be LOPT + SPACE.
+
+You can build either of these firmware images by running the following commands:
+
+```
+make handwired/footy:handy
+make handwired/footy:superwhisper
+```