Added image for API key

Added image for API key

Author: graut

README.md

@@ -70,6 +70,9 @@ Table of contents
 
 1. Fill in your **AGILE_DOMAIN**, **AGILE_USER_EMAIL**, **AGILE_REST_API_KEY** in [**curlwrap_v2.php**](https://github.com/agilecrm/php-api/blob/master/CurlLib/curlwrap_v2.php).
 
+![Finding domain name, email and api key] (https://raw.githubusercontent.com/agilecrm/php-api/master/AgileCRMapi.png)
+
+
 2. Copy and paste the source / include the [**curlwrap_v2.php**](https://github.com/agilecrm/php-api/blob/master/CurlLib/curlwrap_v2.php) in your php code.
 
 3. You need to provide 4 paramaters to the curl_wrap function. They are **$entity**, **$data**, **$method**, **$content-type**.