Add error example

Author: Melroy van den Berg

README.md

@@ -28,6 +28,14 @@ will give the following JSON output:
   "cheat_url": "http://www.gamefaqs.com/console/pc/code/615805.html"
 }```
 
+On error
+--------
+When for some reason the page couldn't be loaded / found or parsed, you will get the following JSON response:
+
+```
+	{"error":"Page could not be loaded!"}
+```
+
 Code example
 ------------
 Please, see [example.php](example.php)