code: func NewRouter() Router {
  	return &router{notFounds: []Handler{http.NotFound}, groups: make([]group, 0)}
  }
docs: // NewRouter creates a new Router instance.
  // If you aren't using ClassicMartini, then you can add Routes as a
  // service with:
  //
  //	m := martini.New()
  //	r := martini.NewRouter()
  //	m.MapTo(r, (*martini.Routes)(nil))
  //
  // If you are using ClassicMartini, then this is done for you.