[Keyboard] Add yandrstudio/nz67v2 keyboard. (#17591)

* add yr nz67v2 by jiaxin96

keyboards/yandrstudio/nz67v2/readme.md

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+# nz67v2
+
+![nz67v2](https://i.imgur.com/AHmBuAqh.png)
+
+A 67 keys keyboard with rgb (key and underground).
+This keyboard use 16mhz HSE and APM32F103 as MCU.
+
+- Keyboard Maintainer: https://github.com/jiaxin96
+- Hardware Supported: nz67v2
+- Hardware Availability: [Y&R Works](https://shop417111022.taobao.com/?spm=2013.1.1000126.2.6aea6fa3Uxufe5), [5162](https://shop294487007.taobao.com/?spm=a230r.7195193.1997079397.2.763853eeeaoRl4)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make yandrstudio/nz67v2:default
+
+See [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) then the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
+
+## Bootloader
+
+Enter the bootloader in 2 ways:
+
+- **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key which is Escape in this keyboard) and plug in the keyboard
+- **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available.