Add title description

functions.php

function skillcrushstarter_setup() {

	// Post thumbnails support
	add_theme_support('post-thumbnails');

	// Register Menus 
	register_nav_menus ( array (
		'primary-menu' => __( 'Primary Menu', 'skillcrushstarter' ),
		'secondary' => __( 'Secondary Menu', 'skillcrushstarter' ),  
	) );
  
	// Let WordPress take care of outputting the title
	add_theme_support( 'title-tag' );
	// but change the separator from '-' to '|'
	function skillcrushstarter_custom_title_separator($sep) {
		$sep = '|';
		return $sep;
	}
	add_filter('document_title_separator', 'skillcrushstarter_custom_title_separator');
  
  
}

add_action( 'after_setup_theme', 'skillcrushstarter_setup' );