code: func New(cfg *Config) *Application {
  	if cfg == nil {
  		cfg = &Config{}
  	}
  
  	if cfg.Router == nil {
  		cfg.Router = chi.NewRouter()
  	}
  
  	if cfg.AssetFS == nil {
  		cfg.AssetFS = assetfs.AssetFS()
  	}
  
  	return &Application{
  		Config: cfg,
  	}
  }
docs: // New new application