code: private static List<AttributesColumn> createColumns() {
  
  		List<AttributesColumn> columns = new ArrayList<>();
  		int index = 0;
  
  		columns.add(AttributesColumn.createPrimaryKeyColumn(index++, COLUMN_ID));
  		columns.add(AttributesColumn.createColumn(index++, COLUMN_NAME,
  				GeoPackageDataType.TEXT, false, null));
  		columns.add(AttributesColumn.createColumn(index++, COLUMN_DESCRIPTION,
  				GeoPackageDataType.TEXT, false, null));
  		columns.add(AttributesColumn.createColumn(index++, COLUMN_COLOR,
  				GeoPackageDataType.TEXT, false, null));
  		columns.add(AttributesColumn.createColumn(index++, COLUMN_OPACITY,
  				GeoPackageDataType.REAL, false, null));
  		columns.add(AttributesColumn.createColumn(index++, COLUMN_WIDTH,
  				GeoPackageDataType.REAL, false, null));
  		columns.add(AttributesColumn.createColumn(index++, COLUMN_FILL_COLOR,
  				GeoPackageDataType.TEXT, false, null));
  		columns.add(AttributesColumn.createColumn(index++, COLUMN_FILL_OPACITY,
  				GeoPackageDataType.REAL, false, null));
  
  		return columns;
  	}
docs: Create the style columns
  
  @return columns