input: Write a python function to store and update the highest scores in a game.
  assert high_scores.get_scores() == [0, 0, 0, 0, 0]
  high_scores.add_score(50)
  assert high_scores.get_scores() == [50, 0, 0, 0, 0]
  high_scores.add_score(70)
  assert high_scores.get_scores() == [50, 70, 0, 0, 0]
  high_scores.add_score(20)
  assert high_scores.get_scores() == [50, 70, 20, 0, 0]
  high_scores.add_score(90)
  assert high_scores.get_scores() == [50, 70, 20, 90, 0]
  high_scores.add_score(10)
  assert high_scores.get_scores() == [50, 70, 20, 90, 10]
  high_scores.add_score(60)
  assert high_scores.get_scores() == [60, 70, 20, 90, 10]
  high_scores.add_score(5)
  assert high_scores.get_scores() == [60, 70, 20, 90, 10]
  high_scores.add_score(100)
  assert high_scores.get_scores() == [60, 70, 100, 90, 10]
output: class HighScores:
      def __init__(self):
          self.scores = [0, 0, 0, 0, 0]
  
      def add_score(self, score):
          if score > min(self.scores):
              self.scores[self.scores.index(min(self.scores))] = score
  
      def get_scores(self):
          return self.scores
  
  high_scores = HighScores()