[Keyboard] Add yandrstudio/transition80 (#19790)

Co-authored-by: Drashna Jaelre <drashna@live.com>

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+# transition80
+
+![transition80](https://i.imgur.com/2A0AWs2h.jpg)
+A 80% keyboard.
+
+- Keyboard Maintainer: https://github.com/jiaxin96
+- Hardware Supported: APM32F103 16MHZ
+- Hardware Availability: [swagkeys](https://swagkeys.com/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make yandrstudio/transition80:default
+
+Flashing example for this keyboard:
+
+    make yandrstudio/transition80:default:flash
+
+
+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.