在wordpress中重写url以获取其他php文件

I have created php file in theme. So for that page I am getting url as:

.../site-name/wp-content/themes/mytheme/admin-dashboard.php

I want it as

../site-name/admin-dashboard

So how to do it?Using htaccess or is there any other way

1. create a new wp page, name it admin-dashboard
2. create a shortcode for admin-dashboard.php content and add it to admin-dashboard wp page