It used to be a bit of pain enabling SSL during the development of a project. Just knowing where to look and what to do was not the simplest thing, and usually once you know how, you would never allow yourself to forget it.
The futur (like now)
Enabling SSL in an asp.net core app is now really simple, it is now a simple checkbox in a more intuitive place in the properties of your app. Just like before in order to view the properties of the app you can still either right click on the project and go all the way down the menu and select Properties, or simpley do Alt+Enter and that will open up the properties tab of your project.
Once open just select the Debug tab (since we are in dev) and check the Enable SSL check box a URL will be generated using HTTPS