public function addFile($file, $writeable = false): ConfigCollection {
        $config = FileConfig::load($file, $writeable);
        if ($config) {
            $this->addConfig($config);
        }
        return $this;
    }
public function addFile($file, $writeable = false): ConfigCollection {
        $config = FileConfig::load($file, $writeable);
        if ($config) {
            $this->addConfig($config);
        }
        return $this;
    }
public function addFile ( $ file , $ writeable = false ) : ConfigCollection { $ config = FileConfig :: load ( $ file , $ writeable ) ; if ( $ config ) { $ this -> addConfig ( $ config ) ; } return $ this ; }
Add a physical config file

@param string $file
@param bool $writeable
@return ConfigCollection
Add a physical config file