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…
100% agree! I always get so frustrated when there are no screenshots in the README.md or on the site.
On github you can even paste your screenshot right from the clipboard. Zero excuses for not having a screenshot.