Because K2 is closed source the required K2/SourceCode dlls are not included in this project.
The configure script will help copy the required dlls from your local/remote install into this package.
To include the required dll files from your install use the configure tool.
configure.ps1 -k2path "c:\Program Files (x86)\K2 blackpearl\"
build.ps1
This will create a 'build' folder on the root containing the nupkg files.
See hosting your own nuget feeds
Creating custom controls - http://help.k2.com/en/k2smartforms1.02devref.aspx
Creating and Publishing a Package - http://docs.nuget.org/docs/creating-packages/creating-and-publishing-a-package
hosting your own nuget feeds - http://docs.nuget.org/docs/creating-packages/hosting-your-own-nuget-feeds