dist intro client/server code

dist-intro/README.md

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+
+# Distributed Systems: Introduction
+
+A simple UDP client and server:
+- `client.c`: example client code, sends a message to the server and waits for a reply
+- `server.c`: example server code, waits for messages indefinitely and replies
+
+Both use `udp.c` as a simple UDP communication library.
+
+The `Makefile` builds `client` and `server` executables. Type `make` to do this.
+
+To run: type `server &` to run the server in the background; then type `client` to
+run the client. You will likely then want to kill the server if you are done.
+
+If you want to run these on different machines, you'll have to change the client
+to send messages to the machine the server is running upon, instead of `localhost`.
+