code: def add_table(self, rows, cols, width):
          
          from .table import Table
          tbl = CT_Tbl.new_tbl(rows, cols, width)
          self._element._insert_tbl(tbl)
          return Table(tbl, self)
docs: Return a table of *width* having *rows* rows and *cols* columns,
          newly appended to the content in this container. *width* is evenly
          distributed between the table columns.