[Keyboard] Add Monoflex 60 keyboard (#16234)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/monoflex60/readme.md

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+# Monoflex 60
+
+Monoflex 60 is a 60% keyboard with leafsping plate. The project failed because of a stupid runner (SantiGo Customs) who didn't know how to manage money.
+
+Case designed by [Bizunow](https://github.com/Bizunow) and PCB designed by [keyten](https://github.com/key10iq). Also [ILWrites](https://github.com/pikeeb) helped with PCBs production.
+
+![Monoflex 60 image](https://i.imgur.com/ip3J0y6l.jpeg)
+
+* Keyboard Maintainer: [keyten](https://github.com/key10iq)
+* Hardware Supported: Monoflex 60 PCB
+* Hardware Availability: [GB](https://geekhack.org/index.php?topic=110738.0)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make monoflex60:default
+	
+Flashing example for this keyboard:
+
+    make monoflex60: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
+* Keycode in layout: Press the key mapped to RESET if it is available
+* Physical reset button: Press the button on the back of the PCB