README.md linkified to celebrate we have C++ < C# 

According to the GitHub language stats bar (the colored banner above the code at https://GitHub.com/cefsharp/CefSharp) we recently tipped the scales into being a C# project.
README.md now mentions MinimalExample
Update README.md

Nits and a broken link, gaah...
Merge pull request #325 from jornh/README-patch

README.md patch to celebrate we have C# > C++