Add a menu item in the backend

function add_backend_panel(){
  add_menu_page('Name', 'Label, 'edit_dashboard', 'attendees-list', 'ContentFunction', 'dashicons-list-view');
}
add_action('admin_menu', 'add_backend_panel');

// function to display created page content 

function ContentFunction(){
echo 'Content goes here.';
}