doc, examples

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diff --git a/examples/Plugins/HelloWorld.hs b/examples/Plugins/HelloWorld.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.HelloWorld
+-- Copyright   :  (c) Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A plugin example for Xmobar, a text based status bar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.HelloWorld where
+
+import Xmobar.Plugins
+
+data HelloWorld = HelloWorld
+    deriving (Read, Show)
+
+instance Exec HelloWorld where
+    alias HelloWorld = "helloWorld"
+    run   HelloWorld = return "<fc=red>Hello World!!</fc>"