[Keyboard] Add MNK60 (#21204)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: jack <0x6a73@protonmail.com>

keyboards/kopibeng/mnk60/readme.md

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+# MNK60
+
+![MNK60](https://i.imgur.com/n1arBEh.png)
+
+A QMK-powered, VIA-enabled universal 60% PCB with support for ANSI/ISO layouts, split Backspace, split Right Shift, stepped Caps Lock, 6.25U/7U bottom row, split Spacebar and RGB underglow. 
+
+* Keyboard Maintainer: [kopibeng](https://github.com/kopibeng)
+* Hardware Supported: KEI
+* Hardware Availability: [MONOKEI](https://monokei.co)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make kopibeng/mnk60:default
+	
+Flashing example for this keyboard:
+
+    make kopibeng/mnk60: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
+
+* Physical reset button: Press the RESET switch on top side of PCB.
+* Bootmagic reset: Unplug keyboard, hold down ESC key and plug in the keyboard.
+* Keycode reset: Press the `QK_BOOT` keycode (default: MO(1) + R keys) in layout if available.