func NewGroup(path string, handlerList ...elton.Handler) *elton.Group {
	g := elton.NewGroup(path, handlerList...)
	groupList = append(groupList, g)
	return g
}
NewGroup new router group
package router
import (
	"github.com/vicanso/elton"
)
var (
	groupList = make([]*elton.Group, 0)
)