title: How to extend ViewPager2 with a dot indicator?
body: <p>I'm currently working on a instruction manual, which does have pages - and uses <code>ViewPager2</code>.</p>
  <p>So far I've found dot-indicators for <code>ViewPager</code>, but not for <code>ViewPager2</code>. I'd like to provide better visual feedback, so that one can see that there's more pages, to begin with. How to extend ViewPager2 with a dot indicator, with the least effort? This is not a request for off-site resources - despite my own answer uses a library. Feel free to add a better (more light-weight) answer.</p>