updated README

Author: jonathanBieler

README.md

@@ -5,3 +5,14 @@
 [![Coverage Status](https://coveralls.io/repos/jonathanBieler/GtkMarkdownTextView.jl/badge.svg?branch=master&service=github)](https://coveralls.io/github/jonathanBieler/GtkMarkdownTextView.jl?branch=master)
 
 [![codecov.io](http://codecov.io/github/jonathanBieler/GtkMarkdownTextView.jl/coverage.svg?branch=master)](http://codecov.io/github/jonathanBieler/GtkMarkdownTextView.jl?branch=master)
+
+A Widget to display Markdown formatted text:
+
+```julia
+w = GtkWindow("")
+
+md = "# test\n ## test\n*test* test **test**\n - test\n\ttest"
+v = MarkdownTextView(md)
+push!(w,v)
+showall(w)
+```