Wordpress custom admin notice

functions.php

/*************************/
/*  Custom admin notice  */ 
/*************************/
// Add temporary dashboard message about plugin_name for team
function plugin_name_admin_notices() {
    echo '<div class="notice notice-warning is-dismissible"><p><strong>/!\ @website team /!\</strong>: Please do not use plugin_name for the moment. It is not fully configurated yet. Thanks</p></div>';
}
add_action('admin_notices', 'plugin_name_admin_notices');