Add admin_navigation_appearance filter

source/Reference/filters/admin_navigation_appearance.rst

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+###########################
+admin_navigation_appearance
+###########################
+
+.. versionadded:: 2.5.1
+
+*****
+Usage
+*****
+
+Filters the navigation for the appearance settings pages of the admin theme. 
+
+*****
+Value
+*****
+
+``array`` $nav
+    An array of arrays as used by Zend_Navigation.
+
+
+*********
+Arguments
+*********
+
+None
+
+
+********
+Examples
+********
+
+The array that forms the basis for the appearance navigation is: 
+
+.. code-block:: php
+
+    $navArray = array(
+        array(
+            'label' => __('Themes'),
+            'uri' => url('themes'),
+            'resource' => 'Themes',
+            'privilege' => 'edit'
+        ),
+        array(
+            'label' => __('Navigation'),
+            'uri' => url('appearance/edit-navigation')
+        ),
+        array(
+            'label' => __('Settings'),
+            'uri' => url('appearance/edit-settings')
+        ),
+    );
+        
+    
+To add a new link to the appearance nav, you would use this filter like this:     
+
+.. code-block:: php
+
+    public function filterAdminNavigationAppearance($nav) 
+    {
+        $nav[] = array(
+            'label' => __('My Plugin Settings'),
+            'uri' => url('my-plugin/settings')
+        );
+        return $nav;
+    }
+