-gameField class filled with empty functions
  -int gameField::check()	check if active player win, or it is draw.
Returns int 0 - nothing; 1 - win; 2 - draw
  -gameField::getField()  returns game field as an array of int 0 -
empty cell; 1 - cross; 2 - zero
  -gameField::buildField()  private function executes in constructor
just build empty game field