[Keyboard] Initial FM-S and FM-H support (#17765)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

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+# GeonWorks Frog Mini PCB firmware
+
+![FM_image](https://i.imgur.com/mhCsc6Mh.jpg)
+
+The Frog Mini is a 60% keyboard designed by GeonWorks, with PCB by Gondolindrim.
+
+Two PCB variants are offered: FM-S (solderable) and FM-H (hotswap with Kailh sockets).
+
+* Keyboard Maintainer: [Gondolindrim](https://github.com/gondolindrim)
+* Hardware Availability: proprietary PCB sold by [Geon.Works](https://geon.works/)
+* Website: [GeonWorks](https://geon.works/pages/frog-mini)
+
+## How to flash
+
+### Enter bootloader
+
+### Release Alpha:
+
+The DFU state in the bootloader can be accessed in 2 ways:
+
+* **Bootmagic reset**: hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: press the button on the back of the PCB
+* **Keycode in layout**: press the key mapped to `RESET` if it is available (ESC key at layer 1 in the default layout)
+
+### Release Beta:
+
+The DFU state in the bootloader can be accessed in 3 ways:
+
+* **Bootmagic reset**: hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: press the button on the back of the PCB, for at least five seconds
+* **Keycode in layout**: press the key mapped to `RESET` if it is available (ESC key at layer 1 in the default layout)
+
+## Compile firmware
+
+### FM-S (solderable)
+
+After accessing the DFU state in your PCB, build the default layout using:
+
+    make geonworks/frogmini/fms:default
+
+### FM-H (hotswap)
+
+After accessing the DFU state in your PCB, build the default layout using:
+
+    make geonworks/frogmini/fmh:default
+
+Then download the resulting binary `*bin` file using `dfu-util` or QMK Toolbox.
+
+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).