Added simpler C# Quick Start example by lythix · Pull Request #274 · commandlineparser/commandline

I struggled to get my head around the examples in the Readme file, since some recent changes to how to use Commandlineparser were introduced.

I have created a simple and minimal example to get up and running. Goal here was to show the minimum amount of code to use command line parser. The advanced fancy stuff can come later in the Readme.