[Keyboard] PK64RGB Keyboard Addition (#14627)

keyboards/playkbtw/pk64rgb/readme.md

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+# Play Keyboard 64RGB
+
+![PK64RGB](https://cdn.store-assets.com/s/409567/i/25281841.png)
+
+A 60% RGB hotswap keyboard PCB made by Play Keyboard.
+
+* Keyboard Maintainer: [Barry Huang](https://github.com/yj7272098)
+* Hardware Supported: Play Keyboard 64 RGB
+* Hardware Availability: [Play Keyboard](http://play-keyboard.store/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make playkbtw/pk64rgb:default
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
+
+You can get into bootloader by pressing the reset button from the back of PCB.
+
+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).