[Keyboard] Add royal directory and add 2 keyboard releases (#8877)
* add royal project folder and 2 released keyboards
* fix iso keymap clarification
* Apply suggestions from code review
* Update keyboards/the_royal/schwann/schwann.h
* Update keyboards/the_royal/liminal/liminal.h
* Update keyboards/the_royal/schwann/keymaps/default/keymap.c
* Apply suggestions from code review
new
* Update keymap.c
* Update keymap.c
* Apply suggestions from code review
* Update rules.mk
* add rules.mk to schwann default
* Apply suggestions from code review
* add rules.mk to shwann default
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