added README

README.md

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+# CANtact-app
+
+CANtact-app is an open source software tool for interfacing with Controller Area
+Network systems from the desktop. It is primarily intended to be used with the
+[CANtact hardware](https://github.com/linklayer/cantact-hw), but should work
+with any device that uses the LAWICEL protocol.
+
+## Features
+- Display of CAN bus trace
+- Live display, showing the most recent data for each frame
+- Simple transmission of CAN frames
+- Javascript scripting interface
+
+## TODO
+- ISOTP, OBD-II, and UDS protocol implementations (in progress)
+- Saving, loading, and playing of CAN logs
+- CAN databases and signal decoding
+- etc...