{
    "file_format_version": "1.0.0",
    "ICD": {
        "library_path": "./libVK_nulldrv.so",
        "api_version": "0.210.0"
    }
}

Add json for null driver
nulldrv: Add json for null driver

The null driver is useful for testing code changes in
layers and the loader that don't depend on a real ICD
so add a json file to make it easier to use.
