[Keyboard] Add Chaos65 keyboard (#17369)

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/chaos65/readme.md

@@ -0,0 +1,25 @@
+# Chaos 65
+
+![chaos65](https://i.imgur.com/BbrA6Tvl.jpg)
+
+A 65% gasket mounted keyboard with some nice accents
+
+* Keyboard Maintainer: [kb-elmo](https://github.com/kb-elmo)
+* Hardware Supported: Vem Chaos PCB
+* Hardware Availability: https://www.thomasltstudio.com/product-page/chaos-65-keyboard
+
+Make example for this keyboard (after setting up your build environment):
+
+    make chaos65:default
+
+Flashing example for this keyboard:
+
+    make chaos65: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
+
+* **Bootmagic reset**: Hold down the top left key and plug in the keyboard
+* **Physical reset button**: Briefly press the button labeled "Reset" on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available