Dextem is a simple .NET library to convert Visual Studio XML Documentation to GitHub Markdown. It is based on this nice, succinct Gist: dx2md.
See the result of Dextem at work. It processed its xml documentation and produced the following results: Dextem API Reference.
Meant to run Post-build, Dextem.Build is a console application that uses the default Dextem API to create a markdown file based on a project's XML Documentation file. See the full Dextem.Build Command-Line Reference.
Simply add a line to your Post-Build event:
Dextem.Build.exe $(TargetDir)$(ProjectName).XML <filename>.md
Note: The target project must be configured to output its XML documentation file. More Info