Merge pull request #3 from aws/fix/add-something-to-the-readme

Add a quick description and example to the readme

Author: jeskew

README.md

@@ -1,2 +1,30 @@
 # Amazon SNS message Validator for PHP
 
+[![@awsforphp on Twitter](http://img.shields.io/badge/twitter-%40awsforphp-blue.svg?style=flat)](https://twitter.com/awsforphp)
+[![Total Downloads](https://img.shields.io/packagist/dt/aws/aws-php-sns-message-validator.svg?style=flat)](https://packagist.org/packages/aws/aws-php-sns-message-validator)
+[![Build Status](https://img.shields.io/travis/aws/aws-php-sns-message-validator.svg?style=flat)](https://travis-ci.org/aws/aws-php-sns-message-validator)
+[![Apache 2 License](https://img.shields.io/packagist/l/aws/aws-php-sns-message-validator.svg?style=flat)](http://aws.amazon.com/apache-2-0/)
+
+The **Amazon SNS Message Validator for PHP** allows you to validate that incoming
+HTTP(S) messages are legitimate SNS notifications. This library does not depend
+on the AWS SDK for PHP or Guzzle, but it does require that the OpenSSL PHP 
+extension be installed.
+
+## Usage
+
+```php
+<?php
+
+require 'vendor/autoload.php';
+
+use Aws\Sns\Message;
+use Aws\Sns\MessageValidator;
+ 
+$message = Message::fromRawPostData();
+ 
+// Validate the message
+$validator = new MessageValidator();
+if ($validator->isValid($message)) {
+   // do something with the message
+}
+```