[Keyboard] Add key-ripper (#19598)

keyboards/bschwind/key_ripper/readme.md

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+# key_ripper
+
+A 75-key keyboard which has a similar layout to a MacBook keyboard, and sacrifices
+the right shift key to keep a compact size. Based on the RP2040 microcontroller.
+
+![key_ripper](https://imgur.com/pL26kVSh.png)
+![key_ripper](https://imgur.com/FnvZREyh.png)
+![key_ripper](https://imgur.com/xe8wImMh.png)
+
+* Keyboard Maintainer: [Brian Schwind](https://github.com/bschwind)
+* Hardware Supported: The key-ripper PCB
+* Hardware Availability: You can find production files in the [releases](https://github.com/bschwind/key-ripper/releases) page used for ordering from JLCPCB.
+
+Make example for this keyboard (after setting up your build environment):
+
+    make bschwind/key_ripper:default
+
+Flashing example for this keyboard:
+
+    make bschwind/key_ripper: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 Escape key and plug in the keyboard
+* **Physical reset button**: Hold down the USB BOOT button on the PCB, and briefly press the RESET button on the PCB.