Add 'adding base styles' stub

Author: adamwathan

navigation.php

@@ -15,6 +15,7 @@
         'State Variants' => 'state-variants',
         'Adding New Utilities' => 'adding-new-utilities',
         'Extracting Components' => 'extracting-components',
+        'Adding Base Styles' => 'adding-base-styles',
         'Functions & Directives' => 'functions-and-directives',
     ],
     'Customizing' => [

source/docs/adding-base-styles.blade.md

@@ -0,0 +1,8 @@
+---
+extends: _layouts.documentation
+title: "Adding Base Styles"
+description: "Best practices for adding your own global base styles on top of Tailwind."
+titleBorder: true
+---
+
+Coming soon.