create a tic tac toe game with a char grid

class TicTacToe:
  def __init__(self):
    self.char_grid = [
      ["-", "-", "-"],
      ["-", "-", "-"],
      ["-", "-", "-"]
    ]

  def display_grid(self):
    for row in self.char_grid:
      # print out the row
      for char in row:
        print(char, end="")
      print()