[Keyboard] Add Dayoff60 (#17640)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>

keyboards/nixkeyboards/day_off/readme.md

@@ -0,0 +1,23 @@
+# Day Off Vial Support
+
+[More info at nixkeyboards.com](https://nixkeyboards.com/)
+
+* Keyboard Maintainer: [Schrobie](https://github.com/schrobie)
+* Hardware Supported: Day Off PCBs, both solderable and hotswap
+* Hardware Availability: [Nix Keyboards](https://nixkeyboards.com/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make nixkeyboards/day_off:default
+
+Flashing example for this keyboard:
+
+    make nixkeyboards/day_off: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).
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,1) 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
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available