Add solution to smallest integer in array challenge
user
```ruby
# Smallest Integer

# I worked on this challenge [by myself, with: ].

# smallest_integer is a method that takes an array of integers as its input
# and returns the smallest integer in the array
#
# +list_of_nums+ is an array of integers
# smallest_integer(list_of_nums) should return the smallest integer in +list_of_nums+
#
# If +list_of_nums+ is empty the method should return nil

# Your Solution Below
def smallest_integer(list_of_nums)
  smallest_integer = nil
  
  if list_of_nums.length != 0
    smallest_integer = list_of_nums[0]
  end
  
  list_of_nums.each do |num|
    if smallest_integer > num
      smallest_integer = num
    end
  end
  
  return smallest_integer
  
end```
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