Adds installation instructions.

Author: dsposito

README.md

@@ -2,13 +2,23 @@
 
 A simple SDK interface for interacting with the [Smmry](http://smmry.com) text summarization API.
 
-##Usage
+## Installation
+Run the following [composer](https://getcomposer.org/doc/00-intro.md#installation-linux-unix-osx) command to add the package to your project:
+
+```
+composer require dayrev/smmry-sdk-php
+```
 
-    $sdk = new DayRev\Smmry\SDK(array('api_key' => 'YOURKEYHERE', 'summary_length' => 5));
-    $summary = $sdk->summarizeUrl('http://collegefootball.ap.org/article/mayfield-leads-oklahoma-35-19-sugar-bowl-win-over-auburn');
+Alternatively, add `"dayrev/smmry-sdk-php": "^1.0"` to your composer.json file.
+
+##Usage
+```php
+$sdk = new DayRev\Smmry\SDK(array('api_key' => 'YOURKEYHERE', 'summary_length' => 5));
+$summary = $sdk->summarizeUrl('http://collegefootball.ap.org/article/mayfield-leads-oklahoma-35-19-sugar-bowl-win-over-auburn');
+```
 
 ## Tests
-To run the test suite, install [composer](https://getcomposer.org/doc/00-intro.md#installation-linux-unix-osx) and then run the following commands from the root directory:
+To run the test suite, run the following commands from the root directory:
 
 ```
 composer install