https://docs.microsoft.com/en-us/nuget/create-packages/creating-a-package
cd C:\Projects\github\infinith4\MarkdownNet\MarkdownNet
nuget spec MarkdownNet.csproj
*modified a new version
copy packages directory to same directory.
nuget pack MarkdownNet.csproj -IncludeReferencedProjects -properties Configuration=Release
nuget push infinith.MarkdownNet.1.0.2.nupkg [key] -Source https://api.nuget.org/v3/index.json