Add example for Haskell.

examples/haskell/README.md

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+## Haskell examples
+
+### Count
+
+Start the server with
+
+```
+$ websocketd --port=8080 --devconsole --passenv PATH ./count.hs
+```
+
+The passing of `PATH` was required for me because a typical Haskell installation of `runhaskell` does not go into `/usr/bin` but more like `/usr/local/bin`.

examples/haskell/count.hs

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+#!/usr/bin/env runhaskell
+
+import Control.Monad (forM_)
+import Control.Concurrent (threadDelay)
+
+-- | Count from 1 to 10 with a sleep
+main :: IO ()
+main = forM_ [1 :: Int .. 10] $ \count -> do
+  print count
+  threadDelay 500000