An @-sign in a box, in haskell

Initial commit of a Haskell version of Xanthous, written using Brick and
built with Nix.

This is so much nicer and so much easier

src/Main.hs

@@ -0,0 +1,17 @@
+module Main where
+
+import Xanthous.Prelude
+import Brick
+
+import Xanthous.Game (getInitialState)
+import Xanthous.App (makeApp)
+
+ui :: Widget ()
+ui = str "Hello, world!"
+
+main :: IO ()
+main = do
+  app <- makeApp
+  initialState <- getInitialState
+  _ <- defaultMain app initialState
+  pure ()