[Keyboard] Add Royal Kludge RKG-68 (#20138)

keyboards/rkg68/readme.md

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+# RK G68
+
+![Keyboard picture](https://imgur.com/UnOJPZrh.jpg)
+
+* Keyboard Maintainer: [Royal Kludge](https://rkgamingstore.com/)
+* Hardware Supported: Royal Kludge RK G68
+* Hardware Availability: [RKG 68](http://en.rkgaming.com/download/1/)
+
+After setting up your build environment, you can compile the  default keymap by using:
+
+    make rkg68:default
+
+Flashing example for this keyboard:
+
+    make rkg68: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**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+- **Keycode in layout**: Press the key `FN` and `Left CTRL`.
+
+## Layouts
+
+- ANSI layout;
+
+![Imgur](https://i.imgur.com/l7ka1gkh.png)