functions.php

<?php

/* Create Custom Post Type (CPT)
------------------------------------*/ 

function create_livestream_posttype() {

    $args = array(
        'label' => 'Livestream',
        'public' => false,
    );

    register_post_type( 'livestream', $args );

}

add_action( 'init', 'create_livestream_posttype' );


/* Register Page for CPT
------------------------------------*/ 

function  add_livestream_page() {

    add_menu_page( 'Livestream', 'Livestream', 'edit_pages', 'livestream', 'create_livestream_page', '', 21 );
}

add_action( 'admin_menu', 'add_livestream_page' );


/* Create Page for CPT
------------------------------------*/ 

function create_livestream_page() {
	?>

	<h2>Hello World.</h2>
	
	<?php
}