Add hello world example to readme & format code

docs/Examples/AsyncResponse/Main.purs

@@ -30,7 +30,7 @@ router { route: SayHello } = readTextFile UTF8 filePath >>= ok
 -- | Boot up the server
 main :: ServerM
 main =
-  serve { port: 8080, onStarted } { route, router } 
+  serve { port: 8080, onStarted } { route, router }
   where
   onStarted = do
     log " ┌────────────────────────────────────────────┐"