input: Write a python function to check if two numbers in a list add up to a target value.
  assert find_two_add_up_to_target([1, 2, 3, 4, 5], 9) == True
  assert find_two_add_up_to_target([1, 2, 3, 4, 5], 10) == False
  assert find_two_add_up_to_target([1, 3, 7, 9, 2], 11) == True
  assert find_two_add_up_to_target([1, 3, 7, 9, 2], 14) == False
output: def find_two_add_up_to_target(nums, target):
      seen = set()
      for num in nums:
          if target - num in seen:
              return True
          seen.add(num)
      return False