input: Write a python function to add and remove customers from a dictionary.
  assert customers.customers == {'Alice': 'info1', 'Bob': 'info2'}
  customers.add_customer('Charlie', 'info3')
  assert customers.customers == {'Alice': 'info1', 'Bob': 'info2', 'Charlie': 'info3'}
  customers.remove_customer('Alice')
  assert customers.customers == {'Bob': 'info2', 'Charlie': 'info3'}
output: class Customers:
      def __init__(self):
          self.customers = {}
  
      def add_customer(self, name, info):
          self.customers[name] = info
  
      def remove_customer(self, name):
          if name in self.customers:
              del self.customers[name]
  
  customers = Customers()
  customers.customers = {'Alice': 'info1', 'Bob': 'info2'}