introduce stack build system and restructure code

src/Skat/Render.hs

@@ -0,0 +1,8 @@
+module Skat.Render where
+
+import Data.List
+
+import Skat.Card
+
+render :: [Card] -> IO ()
+render = putStrLn . intercalate "\n" . zipWith (\n c -> show n ++ ") " ++ show c) [0..]