[docs] add readme

README.md

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+eXTReMe IP LOOKUP Client
+------------------------
+
+_A simple wrapper for eXTReMe-IP-LOOKUP.com_
+
+# Installation
+- Add `https://github.com/abreksa4/extreme-ip-lookup-php.git` to your [composer repositories](https://getcomposer.org/doc/05-repositories.md)
+- Run `composer require andrewbreksa/exteme-ip-lookup`
+
+# Usage
+```php
+use AndrewBreksa\ExtremeIPLookup\Client;
+use GuzzleHttp\Client as GuzzleClient;
+use Http\Adapter\Guzzle7\Client as GuzzleAdapter;
+use Http\Message\MessageFactory\GuzzleMessageFactory;
+
+$client = new Client(
+    new GuzzleAdapter(new GuzzleClient()),
+    new GuzzleMessageFactory(),
+    getenv('EXT_IP_KEY')
+);
+
+$ip = '63.70.164.200';
+
+$result = $client->lookup($ip);
+echo $result->isp . PHP_EOL;
+```
+
+`\AndrewBreksa\ExtremeIPLookup\Client::lookup` returns an instance of [`\AndrewBreksa\ExtremeIPLookup\IPResult`](./src/IPResult.php) on 
+success, and throws [`\AndrewBreksa\ExtremeIPLookup\ExtremeIPLookupException`](./src/ExtremeIPLookupException.php) on error.