Here is a first iteration on adding the summary counter.
Added a twig templat...

Here is a first iteration on adding the summary counter.

1. Added a twig template;
   • registered the template in hook_theme()
   • changed the $build array to use the template and passed in the required variables
2. Added CSS which is a copy of the System Update Summary; except some minor changes at certain breakpoints because of the 4 status counters instead of three.
3. Copied the icons to the module itself so there won't be issues with path trying to reference the original ones in core