Added TROUBLESHOOTING + Debug Info

Issue #32

Author: Braunson

TROUBLESHOOTING.md

@@ -0,0 +1,18 @@
+If you can't find a solution below, please open an [issue](https://github.com/sendgrid/php-http-client/issues).
+
+## Table of Contents
+
+* [Viewing the Request Body](#request-body)
+
+<a name="request-body"></a>
+## Viewing the Request Body
+
+When debugging or testing, it may be useful to examine the raw request body to compare against the [documented format](https://sendgrid.com/docs/API_Reference/SMTP_API/index.html).
+
+In the `examples/example.php` file, after your API call use this code to echo out the statuscode, body and headers:
+
+```php
+echo $response->statusCode();
+echo $response->body();
+echo $response->headers();
+```