[Keyboard] AJisai74 (#10021)
* Add keyboard ajisai74
Add ajisai74 keyboard.
A 74 keys ANSI/JIS Layout keyboard.
Salicylic-acid3
* Update keyboards/ajisai74/keymaps/salicylic/keymap.c
* Update keyboards/ajisai74/keymaps/via/keymap.c
* Update keyboards/ajisai74/keymaps/via/keymap.c
* Update keyboards/ajisai74/rules.mk
* Update keyboards/ajisai74/rev1/rev1.h
* Update keyboards/ajisai74/keymaps/default/keymap.c
* Update keyboards/ajisai74/keymaps/default/keymap.c
* Update keyboards/ajisai74/keymaps/jis/keymap.c
* Keymap update
Fixed an unnecessary symbol at the end of the file.
* Update keyboards/ajisai74/readme.md
* Update keyboards/ajisai74/rev1/config.h
* Delete Rev1 directory
I removed the directory because I don't have any plans to update now.
* Update keyboards/ajisai74/rules.mk
* Added copyright
Added copyright to all files.
* Update keyboards/ajisai74/ajisai74.h
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