Add a general README

README.md

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+# Inkclip
+
+Inkclip is an e-paper hair clip.
+
+![An Inkclip lying on a desk.](docs/inkclip.png)
+
+## Features
+
+- It looks cool, if you are the type of person who thinks this kind of things look cool.
+- Use it as more than a hair clip: a pin, a pocket clip, or just a gadget on your desktop.
+- Update the pattern on the hair clip by simply connecting it to a computer via USB.
+  - There is a ready-made web application you can use for this!
+- Everything is open source: the hardware, the firmware, and the webapp.
+
+## Physical characteristics
+
+- Display size: 1.54 inches
+- Resolution: 200 x 200 px
+- Color: black and white
+- Thickness (average): 2.60mm
+- Thickness (thickest): 5.00mm (at micro-B port)
+- Minimum weight (without mounting hardware): 6.5g
+- Typical weight (with a 35mm hair clip): 8.0g
+- Size: 33.40mm x 33.92mm
+  - The shape of the device is a 32.80mm x 38.32mm rectangle with 1mm-radius dogbone corners.
+
+## Project structure
+
+- `hardware/` is the KiCad project for the Inkclip hardware.
+- `firmware/` is a simple firmware for Inkclip that receives image bitmaps and then updates the entire display.
+- `webapp/` is a web application for updating the display that works with the aforementioned firmware.
+
+## Demo
+
+![A demo of an Inkclip refreshing its display.](docs/inkclip-demo.gif)