code: func (s *TeamsService) AddTeamRepo(ctx context.Context, team int64, owner string, repo string, opt *TeamAddTeamRepoOptions) (*Response, error) {
  	u := fmt.Sprintf("teams/%v/repos/%v/%v", team, owner, repo)
  	req, err := s.client.NewRequest("PUT", u, opt)
  	if err != nil {
  		return nil, err
  	}
  
  	return s.client.Do(ctx, req, nil)
  }
docs: // AddTeamRepo adds a repository to be managed by the specified team. The
  // specified repository must be owned by the organization to which the team
  // belongs, or a direct fork of a repository owned by the organization.
  //
  // GitHub API docs: https://developer.github.com/v3/teams/#add-team-repo