Have you looked at this document? http://www.advancedcustomfields.com/resources/including-acf-in-a-plugin-theme/
It explains how to include ACF. In the case of a theme you would replace the WP function calls for getting the theme path and URI with the functions for getting the plugin path and URI
https://codex.wordpress.org/Function_Reference/plugin_dir_path
https://codex.wordpress.org/Function_Reference/plugin_dir_url
