Add Ratio60 PCB (#21609)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>
Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: 4pplet <4pplet@protonmail.com>
Co-authored-by: 4pplet <stefan.ess@gmail.com>

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+# Rati(o)60
+
+A 60% hot swap PCB for both tray mount and o-ring mount
+
+* Keyboard Maintainer: [4pplet](https://github.com/4pplet)
+* Hardware Supported: Rati(o)60 Rev A
+
+Make example for this keyboard (after setting up your build environment):
+
+    make rationalist/ratio60_hotswap/rev_a:default
+
+Flashing example for this keyboard:
+
+    make rationalist/ratio60_hotswap/rev_a: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 Escape and plug in the keyboard
+* **Physical reset button**: Press and hold the button on the back of the PCB or short the reset header for about 3 seconds then release the buttom/remove the short
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available