Add a README

README.md

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+stund
+=====
+
+A minimal asynchronous STUN server implementation.
+
+The server implements the minimal necessary functionality from
+[RFC 8489](https://datatracker.ietf.org/doc/html/rfc8489), namely
+the Binding Request.
+
+The server is both IPv6 and IPv4 capable. When listening on IPv6 address,
+the server is capable of handling IPv6/IPv4 clients.
+
+Running
+-------
+
+To try out the server, just run:
+
+```shell
+$ cargo run
+```
+
+Testing
+-------
+
+To verify the server functions properly, the following tools may be used:
+
+* [Trickle ICE tester from WebRTC github samples](https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/)
+* [IceTest.Info](https://icetest.info/)
+* `stunclient` package from [stunprotocol.org](stunprotocol.org).
+*Note: the server will report an error due to stunclient sending additional attributes not
+recognized by this implementation*