Added new Picture of the Day provider handling 'Image of the day' from Space.com at address:
Language translations need looking into.
Thanks for offering this for inclusion. No time to test myself currently.
Important: can you tell what license space.com has on those images? Can they be used e.g. without a fee by 3rd-party software, like this plugin? I could not find a hint on the linked page on a quick look.
BTW, while I did some fixes to the potd dataengine , I am not the maintainer of it (nor plan to be). So it has to be someone else deciding about whether this plugin can be added.
Given there seems no maintainer of this dataengine these days it would have to be the Plasma team in general, or the person overseeing things like the release manager (@jriddell).
Please update the copyright of all files, your name and the year is missing here.
The KDE translation system needs such in-source translations to be added to the translation database directly. This is a work done by the translator teams, but who first need to see the original string.
And regarding the license of the images, Space.com acquires them from twitter and other public outlets that belong to NASA and its Astronauts. All images are taken by Space.com from public domains with credit to the original contributors. No other mention of any additional copyright notices.