[Keyboard] Add new keyboard ks63 handwired (#9712)

* [feature] add ks63 split keyboard

* [bugfix] unable to compile and some rows are not working

* [feature] add info.json / update keymap

* [bugfix] keymap and fix slave not working issue

* [bugfix] keyboard unaviable on cold boot / unable to reset the board

* [misc] fine tune keymap

* [misc] fine tune keymap

* ...

* ...

* ...

* [misc] adjust brackets position

* [misc] add readme link

* [misc] comply to coding convention

* [misc] add default keymap readme file

* Update keyboards/handwired/ks63/README.md

* Update keyboards/handwired/ks63/ks63.h

* Update keyboards/handwired/ks63/keymaps/default/keymap.c

* Update keyboards/handwired/ks63/keymaps/default/keymap.c

* Update keyboards/handwired/ks63/keymaps/default/keymap.c

* Update keyboards/handwired/ks63/keymaps/default/keymap.c

* Update keyboards/handwired/ks63/keymaps/default/keymap.c

* Update keyboards/handwired/ks63/keymaps/default/keymap.c

* Update keyboards/handwired/ks63/rules.mk

* Update keyboards/handwired/ks63/README.md

* Update keyboards/handwired/ks63/keymaps/default/keymap.c

* [misc] to lowercase filename

* Update keyboards/handwired/ks63/rules.mk

* Update keyboards/handwired/ks63/rules.mk

* Update keyboards/handwired/ks63/config.h

keyboards/handwired/ks63/keymaps/default/readme.md

@@ -0,0 +1,5 @@
+# The default keymap for ks63
+
+This is the default keymap for kb63,
+
+it consists of a base layer with QWERTY layout, a momentary function-keys-layer, a number-keys layer, a  symbol-keys-layer and a hotkeys-multimediakeys-combo layer.