func (gross *Gross) Serve() error {
	return nil
}
begin the service.
the function will not return utils an error occured
package gross
type Gross struct {
	hook *WebHook  
}
type Config struct {
	HookName string
	Addr     string
	Rule     BuildRuler
	Folder   string
	Handler  TargetHandler
}
func New(conf Config) (*Gross, error) {
	h, err := NewWebHook(conf.HookName, conf.Addr, nil)
	if err != nil {
		return nil, err
	}
	return &Gross{
		hook: h,
	}, nil
}