context.go
func (s *RouteParams) Add(key, value string) {
	(*s).Keys = append((*s).Keys, key)
	(*s).Values = append((*s).Values, value)
}
func (s *RouteParams) Add(key, value string) {
	(*s).Keys = append((*s).Keys, key)
	(*s).Values = append((*s).Values, value)
}
// Add will append a URL parameter to the end of the route param