bubble notification

hello i’m wondring how i can add a notification bubble for my plugin
for example

[ Moderator note: please wrap code or log lines in backticks or use the code button. ]

add_action('admin_menu',function(){

add_menu_page('test','test','manage_options',__FILE__,'test');

});

this is only an explanation because i saw some articles they write 100 line just for the bubble anyone can tell me how i can do the notification bubble please

function test(){
if(there is a new email added in the database){
echo do for me a buble notification (1);
}

}