Add some basic information to the README.

README.md

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+okreader
+========
+
+Free/libre firmware for Kobo ebook readers. No proprietary software (except firmware for the WiFi adapter), no spyware and no DRM. Based on [koreader](https://github.com/koreader/koreader) and [Debian](https://www.debian.org/).
+
+
+Supported hardware
+------------------
+
+Tested on:
+* Kobo Touch
+* Kobo Aura
+
+okreader is also expected to work on Kobo Glo out of the box.
+
+There seem to be multiple hardware revisions with different WiFi adapters. The *firmware-okreader* package only provides the required firmware for the adapters in the devices I've tested.
+
+
+Usage
+-----
+
+Note: The build system is intended to run on Debian or Ubuntu, on ARM. Cross-building should also be possible with little effort, but it's not implemented. If you don't have access to an ARM system, you could try using [QEMU](http://qemu.org).
+
+Fetch all resources:
+
+    git clone https://github.com/lgeek/okreader.git
+    cd okreader
+    git submodule init
+    git submodule update
+    ./fetch.sh all
+    
+Build all packages:
+
+    ./build.sh all
+    
+...or, alternatively, one at a time:
+
+    ./build.sh linux-image
+    ./build.sh linux-modules
+    ./build.sh firmware-okreader
+    ./build.sh koreader
+    
+Prepare a Debian rootfs:
+
+    ./build_rootfs.sh
+    
+
+Installation on the device
+--------------------------
+
+To be documented...
+