Completed exercise and added questions into intro file.

>  "puts" adds a line and then the string to the output
Are you sure? We need to be exact in our understanding of the behavior.

Trying running the following script (from a file). 

What do you predict the output will look like?

```
print "foo"
print "foo"
print "foo"
puts "foo"
puts "foo"
puts "foo"
```