Add support for YMD75 V4 - ISO (#22128)

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+# YMD75 V4
+
+75% per key RGB hotswap PCB with North Facing LED.
+
+* Keyboard Maintainer: [zvecr](https://github.com/zvecr)
+* Hardware Availability: <https://ymdkey.com/products/ymd-75-84-v4-rgb-hotswap-pcb-plate-north-facing-via-vial-fully-programmable>
+
+Make example for this keyboard (after setting up your build environment):
+
+    make ymdk/ymd75/rev4/iso:default
+
+Flashing example for this keyboard:
+
+    make ymdk/ymd75/rev4/iso:default:flash
+
+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).
+
+## 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**: Quickly double tap the button on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available