Update README.md

Author: api-postcode

README.md

@@ -1,2 +1,17 @@
-# php-client
-PHP Api Client using Curl
+Api Postcode PHP Client
+=======================
+
+A PHP client for fetching address detials from https://api-postcode.nl
+
+Installation
+------------
+Installation is a quick step process:
+
+1. Download the client with composer
+
+### Step 1: Download php-client using composer
+
+
+``` bash
+$ composer require api-postcode/php-client
+```