This should make it much faster to find the right place to file issues, get help, find out whether upstream maintains an image, etc.
I've done my best to represent each `REPO/maintainer.md` file appropriately, but I might have missed some (or there might be something else a maintainer prefers be listed there, either more or less descriptive, for example), which would be welcome contributions following this change.
Martynov Maxim