Add Keychron S1 (#19378)

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+# Keychron S1
+
+A customizable 75% keyboard with RGB backlight and White backlight.
+
+* Keyboard Maintainer: [Keychron](https://github.com/keychron)
+* Hardware Supported: Keychron S1
+* Hardware Availability: [Keychron](https://www.keychron.com)
+
+Make example for this keyboard (after setting up your build environment):
+
+* For RGB backlight version:
+
+```bash
+make keychron/s1/ansi/rgb:default
+```
+
+* For White backlight version:
+
+```bash
+make keychron/s1/ansi/white:default
+```
+
+Flashing example for this keyboard:
+
+* For RGB backlight version:
+
+```bash
+make keychron/s1/ansi/rgb:default:flash
+```
+
+* For White backlight version:
+
+```bash
+make keychron/s1/ansi/white:default:flash
+```
+
+**Reset Key**: Hold down the key located at *K00*, commonly programmed as *Esc* while plugging in the keyboard.
+
+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).