[Keyboard] Add zos (#22491)

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/zos/65s/readme.md

@@ -0,0 +1,24 @@
+# zos65s
+
+The ZOS65S is a sodlerable PCB for the ZOS 65 keyboard.
+
+* Keyboard Maintainer: [Zenn](https://github.com/ZOSKB)
+* Hardware Supported: Proprietary PCB using ATMEGA32U4 controller
+* Hardware Availability: This will be made available at the ZOS Keyboards website when sales go live (https://www.zoskb.com)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make zos/65s:default
+
+Flashing example for this keyboard:
+
+    make zos/65s: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 2 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