[Keyboard] Add space space keyboard (#11425)

* add space_space keyboard

* update space_space readme

* fix space_space formatting issue

* add layout readme, vid & pid

* experiment

* readme fix

* readme fix

* readme fix

* readme formatting

* readme formatting

* readme formatting

* Update keymap.c

change I+O combo to O+P because of accidental activation

* Update keymap.c

change I+O combo to O+P because of accidental activation

* Update readme.md

change keymap readme to reflect keymap changes

* Apply suggestions from code review

remove deprecated  "key count" from .json

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Apply suggestions from code review

-move combo and modtap defines to the keymap level
-formatting issues

Co-authored-by: Joel Challis <git@zvecr.com>

* move combo defines to keymap level and update config.h

* Apply suggestions from code review

add lower resolution readme picture and sleep LED note

Co-authored-by: Ryan <fauxpark@gmail.com>

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/space_space/keymaps/default/rules.mk

@@ -0,0 +1 @@
+COMBO_ENABLE = yes