input: Write a python function to create an Employee class and retrieve employee information.
  assert Employee('Alice', '123 Main St', 30, 75000).get_info() == ('Alice', '123 Main St', 30, 75000)
  assert Employee('Bob', '456 Oak St', 40, 85000).get_info() == ('Bob', '456 Oak St', 40, 85000)
  assert Employee('Charlie', '789 Pine St', 25, 55000).get_info() == ('Charlie', '789 Pine St', 25, 55000)
output: class Employee:
      def __init__(self, name, address, age, salary):
          self.name = name
          self.address = address
          self.age = age
          self.salary = salary
  
      def get_info(self):
          return (self.name, self.address, self.age, self.salary)