related to #1693 changed smarty version to 4.1.0

include/smarty/docs/programmers/api-functions/api-add-config-dir.md

@@ -0,0 +1,49 @@
+addConfigDir()
+
+add a directory to the list of directories where config files are stored
+
+Description
+===========
+
+Smarty
+
+addConfigDir
+
+string\|array
+
+config\_dir
+
+string
+
+key
+
+
+    <?php
+
+    // add directory where config files are stored
+    $smarty->addConigDir('./config_1');
+
+    // add directory where config files are stored and specify array-key
+    $smarty->addConfigDir('./config_1', 'one');
+
+    // add multiple directories where config files are stored and specify array-keys
+    $smarty->addTemplateDir(array(
+        'two' => './config_2',
+        'three' => './config_3',
+    ));
+
+    // view the template dir chain
+    var_dump($smarty->getConfigDir());
+
+    // chaining of method calls
+    $smarty->setConfigDir('./config')
+           ->addConfigDir('./config_1', 'one')
+           ->addConfigDir('./config_2', 'two');
+
+    ?>
+
+       
+
+See also [`getConfigDir()`](#api.get.config.dir),
+[`setConfigDir()`](#api.set.config.dir) and
+[`$config_dir`](#variable.config.dir).