Add Haskell port

haskell/README.md

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+# Haskell port of the Gilded-Rose Kata
+
+This is a Haskell port of the *Gilded-Rose-Kata*. For updates and pull-request
+on this haskell port go to https://github.com/sheyll/gilded-rose-haskell
+
+## Building and Running
+
+Run `./install_deps.sh` initially, then `./test.sh` to execute the tests after
+each refactoring.
+
+To execute the program run `./run.sh [days]` where `[days]` denotes an optional
+parameter for the number of days to simulate.
+
+Tests are in `test/GildedRoseSpec.hs`. Refer to http://hspec.github.io/ for
+more information about writing tests using `Hspec`.