how to add jquery to wordpress

I think I found your problem. In your header.php file you’ve not put wp_head() and also on your footer.php you’ve missed wp_footer(). Where actually the scripts and style get hooked. Please add those wp_head() and wp_footer() to header.php and footer.php respectively. If you’re confused how and where you in those files you need to add the functions please have look on any WordPress default theme’s source. You’ll get an idea.

Hope that helps.