qmk_firmware/keyboards/rotr/info.json

{
    "keyboard_name": "rotr", 
    "url": "https://geekhack.org/index.php?topic=107104.0", 
    "maintainer": "qmk", 
    "layouts": {
        "LAYOUT": {
            "layout": [{"x":0, "y":0}, {"x":1, "y":0}, {"x":2, "y":0}]
        }
    }
}