This is the relevant part from the docs: Sample Manifest with Csharp You can also register your files by implementing a IManifestFilter instead of creating a package.manifest. Create a ManifestFilter.cs file and implement the IManifestFilter interface.

csharp
public class ManifestFilter : IManifestFilter
{
    public void Filter(List<PackageManifest> manifests)
    {
        manifests.Add(new PackageManifest
        {
            PackageName = "Sir Trevor",
            Scripts = new[]
            {
                "~/App_Plugins/SirTrevor/SirTrevor.controller.js"
            }, 
            Version = "1.0.0"
        });
    }
}

Then add the ManifestFilter.cs to the CollectionBuilder.

csharp
public class ManifestComposer : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.ManifestFilters().Append<ManifestFilter>();
    }
}