def add_row(row)
      size = row.size
      raise ArgumentError.new("Given a row of data with #{size} entries, but there are only #{@table_columns.size} columns in the table") unless size == @table_columns.size
      @data << row
    end
def add_row(row)
      size = row.size
      raise ArgumentError.new("Given a row of data with #{size} entries, but there are only #{@table_columns.size} columns in the table") unless size == @table_columns.size
      @data << row
    end
Adds a single row to the table
 @param [Array] row An array with a single row of data for the table. Should have the same number of entries as there are columns