[Keyboard] Add edc40 keyboard (#11021)
* Re-adding edc40 keyboard branch/files
* Update keymap.c
* add default keymap for edc40
* removed redundant keymap
* added custom keymap for edc40
* fixed false update to settings.json
* fixed false update to settings.json
* added newline to info.json
* Update keyboards/edc40/config.h
* Update keyboards/edc40/readme.md
* Update keyboards/edc40/rules.mk
* Update rules.mk
* Update keyboards/edc40/info.json
* Update info.json
* Update info.json
* Update keyboards/edc40/config.h
* Update keyboards/edc40/info.json
* Update keyboards/edc40/readme.md
* Update keyboards/edc40/keymaps/default/keymap.c
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