As he said, .Xdefaults is created manually in your $HOME. Check Google for some example ones.
Just to note, the borderless aspect of any program is not handled by the program, it is done completely by the window manager, so don't bother trying to get .Xdefaults to remove the borders.
Depending on your wm there are different ways to do it. Or you could try to get a third party program to do it (forget the name, devilfish or spine something).
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