Updating README documentation

Author: Ben Ramsey

README.md

@@ -1,11 +1,14 @@
-php-sdk
-=======
+# ShootProof PHP SDK
 
-A PHP SDK to interact with the ShootProof API. API and Auth documentation can be found at http://developer.shootproof.com.
+A PHP SDK to interact with the ShootProof API. API and Auth documentation can
+be found at [http://developer.shootproof.com](http://developer.shootproof.com).
 
-```json
-   "require": {
-      "shootproof/php-sdk" : "master"
-   }
+## Installation
 
+We recommend using [Composer](https://getcomposer.org/) to manage your PHP
+application's dependencies. The ShootProof PHP SDK may be installed by adding
+it as a Composer requirement to your project:
+
+```bash
+composer.phar require shootproof/php-sdk
 ```