[Keyboard] KeebMonkey KBMG68 (#15909)

* added KeebMonkey KBMG68.

* Update keyboards/keebmonkey/kbmg68/config.h

* changes requested by fauxpark .

* Apply suggestions from code review

changes suggested by fauxpark

* Update readme.md

changes requested by fauxpark

* Apply suggestions from code review

changes requested by noroadsleft.

* Apply suggestions from code review per fauxpark

keyboards/keebmonkey/kbmg68/readme.md

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+# KBMG68
+
+![KBMG68](https://cdn.shopify.com/s/files/1/0463/5980/6101/products/IMG_2062_600x.jpg?v=1636042030)
+
+The Keebmonkey KBMG68 should be the cheapest gasket keyboard you can ever have. Both the plate and the PCB are gasket mounted, resulting in a deep thocky sound. The shell of the kit is made of 6-layers of acrylic boards, leaving huge space for modding and continuous improvements (even though this kit already sounds perfect when it's out of the box).
+
+* Keyboard Maintainer: Unknown
+* Hardware Supported: Unknown
+* Hardware Availability: [Keebmonkey KBMG68 Double Mounted Gasket Keyboard Kit](https://www.keebmonkey.com/products/kbmg68)
+
+## Instructions
+
+### Build
+
+Make example for this keyboard (after setting up your build environment):
+
+    make keebmonkey/kbmg68:default
+
+Flashing example for this keyboard:
+
+    make keebmonkey/kbmg68: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).
+
+### Reset to Bootloader
+
+Hold the Escape key while plugging the board in.