Add new 4x12 ortho layout & add credit to XD75 port (#1782)
* add xd75, preliminary RGB'
* fix RGB
* add backlight support (probably)
* updated readme and tweaked keymap
* added xd75 to list in /keyboards
* copyright ALL the things, create blank slate for Colemak Mod-DH Split/Wide keymap
* Add preliminary split Colemak Mod-DH layout
* changing stuff to compile properly
* attribution
* moar attribution
* removed incomplete keymap
* Create Colemak Mod-DH Wide layout for 4x12 ortho.
* Move Adjust key
* Add layou timage to readme
* fix naming
* Fix stupid issue with not understanding how the keymap works
* forgot to switch COLEMAK to COLEMAKDH...
* Remove and link image
* Remove and link image
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