Add README
Add screenshot to README
Change submodule discount to own fork on github
update submodule discount
update submodule discount
Add QThread subclass that generates the HTML

closes issue #2

Add QThread-subclass HtmlPreviewGenerator that generates the HTML for
the live preview from the entered markdown text.
Merge branch 'feature-async-preview' into develop
update submodule discount
Add support for MINGW
Implement file menu entries fully
Merge branch 'develop'