input: Write a python function to create a voting system that allows voting for options and retrieves all votes.
  assert vs.vote(1, 'Option A') == True
  assert vs.vote(1, 'Option B') == False
  assert vs.get_all_votes() == {1: 'Option A'}
  assert vs.vote(2, 'Option B') == True
  assert vs.get_all_votes() == {1: 'Option A', 2: 'Option B'}
output: class VotingSystem:
      def __init__(self):
          self.votes = {}
  
      def vote(self, voter_id, option):
          if voter_id in self.votes:
              return False
          self.votes[voter_id] = option
          return True
  
      def get_all_votes(self):
          return self.votes
  
  vs = VotingSystem()