Continuous integration is an important topic : automate tedious tasks and focus on code instead. I’ll explain you how to configure a simple VSTS build definition to publish a NuGet version on each source commit.
First, be sur you have the Visual Studio project source code available from Visual Studio Team Services (VSTS) : GitHub is a well known git repository provider supported.
Your library must also be specified for NuGet with a .nuspec manifest file, or eventually use directly your .csproj for simple packages.
I have a simple library called Orkester as an example.
After creating your Visual Studio Team Services project from dashboard, navigate to the Build tab.