Added support for gmmk pro rev2 keyboard. (#17655)

Co-authored-by: Joy <chang.li@westberrytech.com>

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+# GMMK PRO (ISO)
+
+A tenkeyless 75% keyboard made and sold by Glorious LLC. Equipped with the WestBerry G7 ARM Cortex-M4 microcontroller, with support for rotary encoders and three additional layouts. [More info at Glorious](https://www.pcgamingrace.com/products/glorious-gmmk-pro-75-barebone-iso-black-slate)
+
+* Keyboard Maintainer: [GloriousThrall](https://github.com/GloriousThrall)
+* Hardware Supported: GMMK Pro
+* Hardware Availability: [GloriousPCGaming.com](https://www.pcgamingrace.com/products/glorious-gmmk-pro-75-barebone-iso-black-slate)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make gmmk/pro/rev2/iso:default
+
+Flashing example for this keyboard:
+
+    make gmmk/pro/rev2/iso:default:flash
+
+To reset the board into bootloader mode, do one of the following:
+
+* Hold the Reset switch mounted on the bottom side of the PCB while connecting the USB cable
+* Hold the Escape key while connecting the USB cable (also erases persistent settings)
+* Fn+Backspace will reset the board to bootloader mode if you have flashed the default QMK keymap
+
+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).
+
+## Case Screw Replacements
+
+Many users report stripped case screws when disassembling the board.
+
+The stock case screws are:
+* Thread: M2
+* Thread length: ~5 mm
+* Head diameter: ~3.8 mm
+* Head counterbore diameter: ~4.0 mm
+* Head counterbore depth: ~1.9 mm
+
+Most M2x5mm screws should fit fine, although it's best to ensure that the screw head will fit inside the counterbore.
+For reference, [this hex socket head screw](https://www.mcmaster.com/91292A005/) from McMaster-Carr should fit nearly flush (head will protrude above the counterbore by ~0.1 mm).