Add support for KMAC

keyboards/kmac/readme.md

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+KMAC keyboard firmware
+======================
+
+A Korean custom keyboard designed by Byungho Kim and the KBDMania community.
+
+## Supported models
+
+All the tenkeyless models should be supported.
+
+## Bootloader
+
+The PCB is hardwired to run the bootloader if the key at the `Caps Lock` position is held down when connecting the keyboard.
+
+It is also possible to use Boot Magic and Command to access the bootloader.
+
+## Quantum MK Firmware
+
+For the full Quantum feature list, see the [documentation](https://docs.qmk.fm).
+
+## Building
+
+The KMAC are available with two different PCB layouts, a winkey version and a winkeyless version. A default keymap are provided for each versions of the PCB.
+
+Depending on which PCB and keymap you would like to use, you will have to compile the firmware slightly differently. All of the commands should be run in the [keyboards/kmac](/keyboards/kmac) folder.
+
+### Winkey keymap
+
+The [default keymap](keymaps/default) are designed for the winkey version of the PCB.
+
+### Winkeyless Keymap
+
+A [keymap](keymaps/winkeyless) for the winkeyless version of the PCB are also provided.
+
+### Custom keymaps
+
+To define your own keymap, copy one of the [existing keymap](keymaps) folders and give it the name of your keymap. Then check the [keymap documentation](https://docs.qmk.fm/Keymap.html) for details on how to modify the keymap.
+
+To make it easy to define keymaps for the different versions of the PCB two macros are provided.
+
+| PCB            | Macro                 |
+| -------------- | --------------------- |
+| Winkey PCB     | `KEYMAP()`            |
+| Winkeyless PCB | `KEYMAP_WINKEYLESS()` |
+
+To build the firmware with a custom keymap, run `make <keymap name>`