How do I add a WordPress menu to the content of my page?

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QUESTION
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How do I put a WordPress menu into the content of a WordPress page?

How do I call a navigation menu using a short code?

How do I add a navigation or site map to all sub pages on my page?

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ANSWER
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First setup a menu in WordPress under Appearance, Menus

Then add the following code to your your theme’s FUNCTIONS.PHP file – no difference on where in the file you add it.
(Appearance, Editor, click the Functions.php file on the right)

function print_menu_shortcode($atts, $content = null) {
extract(shortcode_atts(array( 'name' => null, ), $atts));
return wp_nav_menu( array( 'menu' => $name, 'echo' => false ) );
}
add_shortcode('menu', 'print_menu_shortcode');

After adding the code to your FUNCTIONS.PHP file, place the following shortcode in your page content