title: add menu item to the dashboard menu of wordpress
body: <p>I am trying the following syntax to add menu-item on dashboard:</p>
  
  <p><code>&lt;?php add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $position ); ?&gt;</code></p>
  
  <p>But, I am confused where to add this code.</p>
  
  <p>Whether to add it in my theme's functions.php or my plugin's functions.php ?</p>
  
  <p>Or any other way to add custom menu-item on the dashboard of the wordpress logged in as admin ?</p>
  
  <p>I want to add custom menu item like the following image:<img src="https://i.stack.imgur.com/MuLS9.png" alt="add_custom_menu_item"></p>