code: func (c *Config) AddOption(section string, subsection string, key string, value string) *Config {
  	if subsection == "" {
  		c.Section(section).AddOption(key, value)
  	} else {
  		c.Section(section).Subsection(subsection).AddOption(key, value)
  	}
  
  	return c
  }
docs: // AddOption adds an option to a given section and subsection. Use the
  // NoSubsection constant for the subsection argument if no subsection is wanted.