qmk_firmware/layouts/default/ortho_1x1/info.json

{
    "keyboard_name": "1x1 ortholinear layout",
    "url": "",
    "maintainer": "qmk",
    "width": 1,
    "height": 1,
    "layouts": {
        "LAYOUT_ortho_1x1": {
            "layout": [
                {"x":0, "y":0}
            ]
        }
    }
}