[Keyboard] Add UA62 keyboard (#7290)
* Added UA62
Added UA62 Keyboard
* Update readme.md
* Made changes based on code review
Updated files.
* Rename UA62.c to ua62.c
* Rename UA62.h to ua62.h
* Rename keyboards/UA62/readme.md to keyboards/ua62/readme.md
* Rename keyboards/UA62/keymaps/default/keymap.c to keyboards/ua62/keymaps/default/keymap.c
* Rename keyboards/UA62/config.h to keyboards/ua62/config.h
* Update and rename keyboards/UA62/info.json to keyboards/ua62/info.json
* Rename keyboards/UA62/rules.mk to keyboards/ua62/rules.mk
* Rename keyboards/UA62/ua62.c to keyboards/ua62/ua62.c
* Rename keyboards/UA62/ua62.h to keyboards/ua62/ua62.h
* Update keyboards/ua62/readme.md
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