code: public Extensions getOrCreateExtension() {
  
  		// Create table
  		geoPackage.createContentsIdTable();
  
  		Extensions extension = getOrCreate(EXTENSION_NAME, null, null,
  				EXTENSION_DEFINITION, ExtensionScopeType.READ_WRITE);
  
  		return extension;
  	}
docs: Get or create if needed the extension
  
  @return extensions object