Sorry if this question is so basic, I'm new about drupal.
So far which I know, we can create custom module or page in drupal 8 so we can access it with http://www.oursite.com/custompage.
What I need? Is possible to create custom module or page which can show in admin area? In this case, I want to sync a lot of accounts from another system/web app to my drupal site so I don't need to create manually using "people menu" in admin area. Or is there any best way to do that?
Can anyone provide a helpful articles to accomplish this? Help would so appreciated.