I beg you, if you are a developer of an open source app or program - add screenshots of your app to the README file. When looking for the perfect app, I had to install dozens of them just to see what the user interface looked like and whether it suits me. This will allow users to decide if the app they choose will suit them… Please, don’t think about it, just do it…
UI is always the main focus for the user. Because it’s the “User Interface”.
Searching the web for screenshots is an added hassle and something that makes me avoid most FOSS software, because sometimes there’s not enough screenshots and not even the developer cared to show what the app is about.
Well that’s what FOSS is. You can always contribute and add screenshots if you’d like.