Added sample program using SQS

The sample program shows how to create a queue, add messages to it, obtain messages from it, delete messages and finally how to delete the queue. I have a blog post on the same subject here http://timblogsagain.blogspot.com/2013/09/using-amazon-sqs-from-haskell-aws.html which is a bit smaller. I could cut down this example to just that level of detail if that is a better fit for the project.