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<?php
  $config_storage = \Drupal::service('config.storage');
  $config_path = drupal_get_path('module', 'feature_name') . '/config/install';
  $source = new FileStorage($config_path);
  // Wrap the next line in a foreach loop parsing your configuration files
  // located in $config_storage, and importing it.
  // file_name and config_name are identicals. Do not add the .yml part of the
  // filename.
  $config_storage->write('file_name', $source->read('config_name'));