add demo

Main.hs

@@ -3,5 +3,4 @@ import Text.Termcolor.Style
 import qualified Text.Termcolor.Foreground as F
 import qualified Text.Termcolor.Background as B
 
-main = do
-  putStrLn $ format $ underline . bold . (light . B.cyan) . (light . F.red) $ read "Hello guys!"
+main = putStrLn . format . underline . bold . (light . B.cyan) . (F.red) $ read "Hello World!"

README.md

@@ -0,0 +1,15 @@
+termcolor
+=========
+
+Composable terminal colors for Haskell.
+
+```haskell
+import Text.Termcolor
+import Text.Termcolor.Style
+import qualified Text.Termcolor.Foreground as F
+import qualified Text.Termcolor.Background as B
+
+main = putStrLn . format . underline . bold . (light . B.cyan) . (F.red) $ read "Hello World!"
+```
+
+![demo output](https://github.com/mdibaiee/termcolor/tree/master/raw/demo.jpg)