[Keyboard] Add a new keyboard Chidori. (#7496)

* [Keyboard] Add a new keyboard Chidori.

* Update keyboards/chidori/info.json

* Update keyboards/chidori/keymaps/default/keymap.c

* Update keyboards/chidori/chidori.h

* Update keyboards/chidori/keymaps/extended/keymap.c

* Update keyboards/chidori/keymaps/extended/keymap.c

* Update keyboards/chidori/keymaps/extended/keymap.c

* Update keyboards/chidori/keymaps/extended/keymap.c

* Update keyboards/chidori/keymaps/extended/keymap.c

* Update keyboards/chidori/keymaps/extended/keymap.c

* Update keyboards/chidori/keymaps/extended/keymap.c

* Update keyboards/chidori/readme.md

* Update keyboards/chidori/readme.md

* Update keyboards/chidori/readme.md

* Update keyboards/chidori/readme.md

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update keyboards/chidori/rules.mk

* Update rules.mk

* Delete unnecesarry lines.

* Changes layer keys handing.

keyboards/chidori/readme.md

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+# chidori
+
+![Chidori](https://i.imgur.com/QvpLiOvl.jpg)
+
+Yet another split keyboard made with only through-hole components.
+
+* Keyboard Maintainer: [ka2hiro](https://github.com/ka2hiro) [@ka2hiro](https://twitter.com/ka2hiro)
+* Hardware Supported: Chidori PCB, ATMEGA328P
+* Hardware Availability: [@kagizaraya](https://twitter.com/kagizaraya)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make chidori:default:usbasp
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).