Add basic README.

README.md

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+# Inky Frame
+
+This repository is home to the MicroPython firmware and examples for
+Inky Frame - a range of Pico-powered ePaper display boards.
+
+![Three sizes of Inky Frame displayed side-to-side.](inky-frame.png)
+
+## Download Firmware
+
+There are two choices, a regular build that just updates the firmware on
+your board and a "-with-examples" build which includes a ready-to-go set
+of examples (everything in [examples/inkylauncher](examples/inkylauncher))
+that you can interact with right on your display.
+
+:warning: If you've changed any of the code on your board then back up before
+flashing "-with-examples" - *your files will be erased!*
+
+You can find the latest release at [https://github.com/pimoroni/inky-frame/releases/latest](https://github.com/pimoroni/inky-frame/releases/latest).
+
+## Get Inky Frame
+
+* [Inky Frame 7.3"](https://shop.pimoroni.com/products/inky-frame-7-3?variant=40541882056787)
+* [Inky Frame 5.7"](https://shop.pimoroni.com/products/inky-frame-5-7?variant=40057850331219)
+* [Inky Frame 4.0"](https://shop.pimoroni.com/products/inky-frame-4?variant=40443825127507)