To add slider to your theme Template, Post or Page you need to use shortcode.
A shortcode is a WordPress-specific code that lets you do nifty things with very little effort.
If you want to use a short-code from maid booking plugin from within a template file of your WordPress theme instead of with the content of a Post/Page, you can invoke it with a special function:
<?php echo do_shortcode(“[maid_slider]“); ?>