code: def init(dvc_dir):
          
          config_file = os.path.join(dvc_dir, Config.CONFIG)
          open(config_file, "w+").close()
          return Config(dvc_dir)
docs: Initializes dvc config.
  
          Args:
              dvc_dir (str): path to .dvc directory.
  
          Returns:
              dvc.config.Config: config object.