Update readme.md

keyboards/yandrstudio/zhou65/readme.md

@@ -13,3 +13,10 @@ Make example for this keyboard (after setting up your build environment):
 
 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 3 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
+* **Physical reset button**: Short circuit the `bt0` and `vcc` pins on the back of the PCB and plug in the keyboard
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available.