[Keyboard] Add Xenon keyboard (#15915)

Co-authored-by: Sam Mohr <smores56@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>

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+# Xenon
+
+![Xenon](https://i.imgur.com/QYMDzGFh.jpg)
+
+Xenon is 60% columnar staggered keyboard.
+
+* Cherry MX and Kailh low profile key switch support
+* OLED display
+* Full color LED
+* Prototype board area (behind the promicro)
+
+* Keyboard Maintainer: [Narinari](https://github.com/narinari)
+* Keymap Maintainer: [Kyrremann](https://github.com/Kyrremann)
+* Keyboard files can be found here: https://github.com/narinari/xenon-keyboard
+
+Make example for this keyboard (after setting up your build environment):
+
+    make xenon:default
+
+Example of flashing this keyboard:
+
+    make xenon:default:flash
+
+How to enter bootloader (DFU):
+
+Press the reset button next to the TRRS port on the side you are trying to flash (USB must be connected to the Pro Micro that you are flashing).
+
+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
+the [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).