Add example to readme

README.md

@@ -28,6 +28,48 @@ for more details.
 This library is built on req, conduit, and aeson, all of which are very stable
 and usable libraries for working with HTTP requests and web data.
 
+## Example usage
+
+```haskell
+import qualified Data.Aeson as Aeson
+import Data.Aeson ((.=))
+import qualified Data.Text as Text
+import qualified Data.UUID.V4 as UUID
+
+import Urbit.Airlock
+
+main :: IO ()
+main = do
+  let fakezod = Ship
+    { uid = "0123456789abcdef",
+      name = "zod",
+      lastEventId = 1,
+      url = "http://localhost:8081",
+      code = "lidlut-tabwed-pillex-ridrup"
+    }
+
+  -- Establish connection
+  sess <- connect ship
+
+  -- Send a message by poking the chat-hook
+  uuid <- UUID.nextRandom
+  poke sess ship "zod" "chat-hook" "json" $
+    Aeson.object
+      [ "message"
+          .= Aeson.object
+            [ "path" .= Text.pack "/~/~zod/mc",
+              "envelope"
+                .= Aeson.object
+                  [ "uid" .= UUID.toText uuid,
+                    "number" .= (1 :: Int),
+                    "author" .= Text.pack "~zod",
+                    "when" .= (1602118786225 :: Int),
+                    "letter" .= Aeson.object ["text" .= Text.pack "hello world from haskell!"]
+                  ]
+            ]
+      ]
+```
+
 ## TODO
 
 - fix test suite on travis (OOM when trying to compile urbit)