add incomplete config exception

Author: gregor-j

src/IConfig.php

@@ -81,6 +81,7 @@ public function getDest();
      * Generate the type of configuration needed by the PHP module in order to
      * establish a connection to SAP.
      * @return mixed
+     * @throws \phpsap\interfaces\exceptions\IIncompleteConfigException
      */
     public function generateConfig();
 }

src/exceptions/IIncompleteConfigException.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * File src/exceptions/IIncompleteConfigException.php
+ *
+ * The configuration is incomplete.
+ *
+ * @package interfaces
+ * @author  Gregor J.
+ * @license MIT
+ */
+
+namespace phpsap\interfaces\exceptions;
+
+/**
+ * Class phpsap\interfaces\exceptions\IIncompleteConfigException
+ *
+ * TThe configuration is incomplete.
+ *
+ * @package phpsap\interfaces\exceptions
+ * @author  Gregor J.
+ * @license MIT
+ */
+interface IIncompleteConfigException extends ISapException
+{
+}