[Keyboard] Add chord/zero (#18190)

keyboards/chord/zero/readme.md

@@ -0,0 +1,37 @@
+# CHORD ZERO Stenographic Keyboard
+
+![CHORD ZERO](https://i.imgur.com/aS2MPQ2h.jpg)
+
+CHORD ZERO is a stenographic keyboard that can be used with
+[Plover](https://www.openstenoproject.org/plover/) or any other application
+that supports the [TX
+Bolt](https://docs.qmk.fm/#/feature_stenography?id=tx-bolt) or
+[GeminiPR](https://docs.qmk.fm/#/feature_stenography?id=geminipr) protocol.
+
+* Keyboard Maintainer: [Simon Hengel](https://github.com/sol)
+* Hardware Supported: REV 0, REV 1
+* Hardware Availability: https://github.com/sol/chord-zero#readme
+
+Make example for this keyboard (after setting up your build environment):
+
+    make chord/zero:default
+
+or
+
+    qmk compile -kb chord/zero -km default
+
+This will generate `chord_zero_default.uf2`.
+
+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:
+
+* **Reset key combo**: Press the six keys at the outer columns on each side of the keyboard simultaneously while it is plugged in 
+* **Bootmagic reset**: Hold down the top left key and plug in the keyboard
+* **Physical reset button**: Press the button on the back of the PCB and plug in the keyboard
+
+Once the keyboard is in bootloader mode you can mount it as a USB mass storage
+device and copy the firmware (the file `chord_zero_default.uf2`) onto it.  Once
+copying is completed the keyboard will reboot automatically.