related to #1693 changed smarty version to 4.1.0

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

@@ -0,0 +1,49 @@
+addTemplateDir()
+
+add a directory to the list of directories where templates are stored
+
+Description
+===========
+
+Smarty
+
+addTemplateDir
+
+string\|array
+
+template\_dir
+
+string
+
+key
+
+
+    <?php
+
+    // add directory where templates are stored
+    $smarty->addTemplateDir('./templates_1');
+
+    // add directory where templates are stored and specify array-key
+    $smarty->addTemplateDir('./templates_1', 'one');
+
+    // add multiple directories where templates are stored and specify array-keys
+    $smarty->addTemplateDir(array(
+        'two' => './templates_2',
+        'three' => './templates_3',
+    ));
+
+    // view the template dir chain
+    var_dump($smarty->getTemplateDir());
+
+    // chaining of method calls
+    $smarty->setTemplateDir('./templates')
+           ->addTemplateDir('./templates_1', 'one')
+           ->addTemplateDir('./templates_2', 'two');
+
+    ?>
+
+       
+
+See also [`getTemplateDir()`](#api.get.template.dir),
+[`setTemplateDir()`](#api.set.template.dir) and
+[`$template_dir`](#variable.template.dir).