WordPress create a shortcode

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Inside your themes functions.php add the below snippet and fill out the placeholders.

############################################################################
//////////////////////////////////////
// This is your shortcode. You reference it like you see below with the square brackets.
// [shortcode_name_here]
//////////////////////////////////////
function echo_shortcode_function_name(){
    ob_start();
    include '/path to our file';
    return ob_get_clean();
}
add_shortcode( 'shortcode_name_here', 'echo_shortcode_function_name');
############################################################################

Now reference your shortcode and it should load no issues if your file references are correct.