Create Custom html.tpl.php File

I am using the Corporate Clean theme and it does not come with an html.tp.php file and I am not just able to find the head section of the site as to paste any codes in it. I wanted to place some metatags on it and paste the head section part of the facebook like button code, and paste in calls to some of my custom javascript files and just play around with the head section of my site.

I am thinking of creating a custom html.tpl.php

When I view the source file of my site i find the doctype and the head elements, but I cannot find them on the codes in my laptop. I have inspected Drupal Core codes and the files for Corporate Clean.

Please are there easy steps for me to have an html.tpl.php file so I can embed codes in the head section of my site.

Thanks.