Add more info to README

README.md

@@ -1 +1,46 @@
 # haboli
+
+Haboli is a haskell library providing API bindings for
+[the euphoria api](https://api.euphoria.io/). It can be used to create bots and
+otherwise interact with the euphoria servers.
+
+## Basic concept
+
+This library is based around the custom `Client` monad. It is based on `IO` and
+represents computations that happen while a connection to an euphoria server is
+open. Once a `Client` finishes executing, the connection is automatically
+closed. If the connection closes unexpectedly while the corresponding `Client`
+is still running, it is notified and commands like `send` or `nick` will result
+in an exception. The `Client` does not automatically reconnect.
+
+The `Client` monad supports exceptions via the `throw`, `catch` and `handle`
+operations, as well as multiple threads via the `fork` and `wait` operations. It
+supports all session and chat room commands listed in the
+[api reference](https://api.euphoria.io/).
+
+For more information, see the haddock for the `Haboli.Euphoria.Client` and
+`Haboli.Euphoria.Api` modules.
+
+## Example bot
+
+Here is a very basic example bot that Replies to `!ping` with `Pong!`:
+
+```haskell
+pingPongBot :: Client () ()
+pingPongBot = forever $ do
+  event <- respondingToPing nextEvent
+  case event of
+    EventSnapshot _ -> void $ nick "TreeBot"
+    EventSend e ->
+      let msg = sendMessage e
+      in  when (msgContent msg == "!ping") $
+            void $ reply msg "Pong!"
+    _ -> pure ()
+```
+
+And here's how to run that bot:
+
+```haskell
+main :: IO ()
+main = void $ runClient defaultConfig pingPongBot
+```