Add a README.

README.md

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+This bot implements a simple bridge between partychat
+(http://partychapp.appspot.com/) chat rooms and Zephyr
+(http://zephyr.1ts.org/) classes.
+
+It depends on PyZephyr (https://github.com/ebroder/python-zephyr) and
+python-jabberbot (http://thp.io/2007/python-jabberbot/).
+
+You'll need to configure it using a partychat.yml file, looking
+something like:
+
+    chats:
+      ZEPHYR-CLASS-1: PARTYCHAT-1
+      ZEPHYR-CLASS-2: PARTYCHAT-2
+    creds:
+      user: partychat@nelhage.com
+      pass: '<password>'
+
+And then invite the bot to the partychat chats.