code: def add_parser(subparsers, parent_parser):
      ROOT_HELP = (
          "Return the relative path to the root of the DVC project."
      )
      root_parser = subparsers.add_parser(
          "root",
          parents=[parent_parser],
          description=append_doc_link(ROOT_HELP, "root"),
          help=ROOT_HELP,
          formatter_class=formatter.RawDescriptionHelpFormatter,
      )
      root_parser.set_defaults(func=CmdRoot)
  
file_path: dvc/dvc/commands/root.py
imports: from dvc.cli import formatter
  from dvc.cli.command import CmdBaseNoRepo
  from dvc.cli.utils import append_doc_link
  from dvc.log import logger
  from dvc.utils import relpath
label_desc: Use image node_id 1 for calling a global function with example usage: add_parser(subparsers, parent_parser) without return types