Add a feature to upload screenshots by other users

It will be great if users can upload screenshot. This is required because developers not uploading images in many apps

Pls open pull/merge requests in the upstream source code directly so they agree with the content.

Eg. Fastlane file structure ($1895688) · Snippets · Snippets · GitLab

Eg. initial fastlane structures by IzzySoft · Pull Request #194 · cmeng-git/atalk-android · GitHub

Thank you.