使用NuGet.Packaging打包nupkg文件

1、引用NuGet.Packaging包，其中NuGet.Core已被弃用。

2、采用以下代码

ManifestMetadata metadata = new ManifestMetadata()
    {
        Authors = new[] { "Marc" },
        Version = new NuGet.Versioning.NuGetVersion("1.0.0.0"),
        Id =  "myPackageIdentifier",
        Description = "A description",
    };

PackageBuilder builder = new PackageBuilder();
builder.PopulateFiles(folderPath, new[] {new ManifestFile() {Source = "**", Target = @"lib/net452"}});
builder.Populate(metadata);
using(FileStream stream = File.Open(packagePath, FileMode.OpenOrCreate))
{
    builder.Save(stream);
}