Actually write up some start of a README

README.md

@@ -1,2 +1,63 @@
 # kmk_firmware
+
 Mechanical keyboard firmware for humans (and ARM microcontrollers)
+
+KMK is a work-in-progress and proof-of-concept firmware for (usually mechanical)
+keyboards, written in
+[CircuitPython](https://github.com/adafruit/circuitpython), a fork of
+[MicroPython](https://micropython.org/). This allows for high-level and
+expressive keyboard programming and creature comforts that C simply doesn't
+make easy. KMK was heavily inspired by QMK - in fact, KMK was only created
+because QMK didn't correctly support some hardware I bought, and hacking support
+in was going to be a heavy uphill battle.
+
+This project is currently written and maintained by @klardotsh and @kdb424.
+
+
+## Supported Devices
+
+### Officially Supported
+- [Adafruit Feather nRF52 BLE Controller](https://www.adafruit.com/product/3406)
+
+### Support Planned/WIP
+- [Planck rev6 Keyboard](https://olkb.com/planck)
+- [Proton C
+  Controller?](https://www.reddit.com/r/MechanicalKeyboards/comments/87cw36/render_of_the_qmk_proton_c_qmkpowered_pro_micro/)
+    * Does not exist yet, basically a Planck6 in a Pro Micro pin-compat controller chip
+- [Teensy 3.2 Controller](https://www.adafruit.com/product/2756)
+    * Has at least MicroPython, possibly CircuitPython as well
+
+
+## Unsupported Devices
+
+If you don't see it in "Supported Devices", it won't work out of the box, it's
+basically that simple. Pull requests are welcome and encouraged to add support
+for new keyboards. The base requirements for device support are a port of
+CircuitPython (technically base MicroPython could still work), at least
+256KB of flash storage, and USB and/or Bluetooth LE interfaces. DFU
+bootloaders are very strongly encouraged, but not required.
+
+Devices require at least 256KB of flash to run KMK, and that's already pretty
+tight. In general this means that no or almost no Arduinos are or will ever be
+supported. This extends to Arduino-compatibles, including the Pro Micro. If you
+want to run custom firmware on your Pro Micro-equipped keyboard, or for that
+matter anything running the ATmega32U4 (Let's Split, Plancks before rev6,
+hundreds of others), check out [QMK](https://github.com/qmk/qmk_firmware), the
+biggest influence of KMK by far. They're great people.
+
+
+## License, Copyright, and Legal
+
+This project, and all source code within (even if the file is missing headers),
+is licensed
+[GPLv3](https://tldrlegal.com/license/gnu-general-public-license-v3-(gpl-3)) -
+while the tl;dr is linked, the full license text is included in `LICENSE.md` at
+the top of this source tree.
+
+When contributing for the first time, you'll need to sign a Contributor
+Licensing Agreement which is based on the Free Software Foundation's CLA. The
+CLA is basically a two-way promise that this code is and remains yours, but will
+be distributed as part of a larger GPLv3 project. If you'd like to get it out of
+the way early, you can find said CLA [here](
+https://cla-assistant.io/klardotsh/kmk_firmware). If you forget, the bots will
+remind you when you open the pull request, no worries!