hello world

haskell/00-hello-world/README.md

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+# Build
+
+`ghc hello-world.hs`
+
+# Run
+
+`runghc hello-world.hs`
+
+# Run interactively
+```
+ghci
+ghci> :load hello-world.hs
+ghci> main
+```

haskell/00-hello-world/hello-world.hs

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+main :: IO ()
+main = putStrLn "Hello, World!"