怎样在根目录中创建文件夹

"reqPermissions": [
  {
    "name": "ohos.permission.MANAGE_USER_STORAGE"
  },
  {
    "name": "ohos.permission.READ_USER_STORAGE"
  },
  {
    "name": "ohos.permission.WRITE_USER_STORAGE"
  },
  {
    "name": "ohos.permission.READ_MEDIA"
  },
  {
    "name": "ohos.permission.WRITE_MEDIA"
  }
]
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