Adding midterm

You might run into an issue here if a future developer adds an item to the `@cat_facts` array. They don't realize that only the first 6 items are being called since rand has a range of `0..5` A better more extendable approach would be to do something like `@cat_facts[rand(0...@cat_facts.length)]`

Ruby actually gives us an evern easier way to select an item from an array at random. `@random_cat_fact = @cat_facts.sample`