请根据提供的地址描述生成一个GEOJSON文件，描述对象为一个点，地址为“北京市朝阳区建国门外大街1号国贸大厦”。
user
{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "地址": "北京市朝阳区建国门外大街1号国贸大厦"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [116.45921, 39.90744]
      }
    }
  ]
}
assistant