Add README

README.md

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+# card-device-firmware
+
+Firmware and supporting libraries for a custom hardware device.
+Also see the [hardware repository](https://git.shylie.info/shylie/card-device-hardware),
+and the accompanying [host-side software repository](https://git.shylie.info/shylie/mtgcard-upload).
+
+Here are some photos:
+
+<img src="docs/images/pcb.png" alt="pcb image" width="200"/>
+<img src="docs/images/card.jpg" alt="card displayed on device" width="200"/>
+<br/>
+<video width="240" controls>
+  <source src="docs/images/menus.mp4" type="video/mp4">
+</video>
+<video width="240" controls>
+  <source src="docs/images/pong.mp4" type="video/mp4">
+</video>
+