routergroup.go
func (group *RouterGroup) Use(middleware ...RouterHandler) IRoutes {
	group.Handlers = append(group.Handlers, middleware...)
	return group.returnObj()
}
func (group *RouterGroup) Use(middleware ...RouterHandler) IRoutes {
	group.Handlers = append(group.Handlers, middleware...)
	return group.returnObj()
}
// Use adds middleware to the group, see example code in github.