There's a little app that sort of solves the problem I have, it only need some modifications, luckily its open source so you might be able to modify it for me.
The UI is ready, the code to actually stream photos is ready, most of it is ready the only things that need to be modified are:
1. input method: read files from a specific folder and read new files as they are added to it.
2. keep displaying files continuously until the app is quit.
3. (optional) stream images simultaneously from the same app to two different Apple TVs or allow to duplicate the app to each one run one Apple TV.
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I need the app to continuously display photos from a folder on two different Apple TVs. New photos will be added to the folder constantly so the app needs to read the new photos AUTOMATICALLY and display them. The app needs to keep displaying photos endlessly once it reaches the last photo.