Add IntelliPrompt from DLL path

var language = new CSharpSyntaxLanguage();
var project = language.GetService<IProjectAssembly>();
var assemblyLoader = new BackgroundWorker();
assemblyLoader.DoWork += (sender, e) => {
    project.AssemblyReferences.AddMsCorLib();  // MsCorLib should always be added at a minimum
    project.AssemblyReferences.Add("System");
    project.AssemblyReferences.AddFrom(@"C:\MyAssembly.dll");
    project.SourceFiles.QueueFile(language, @"C:\MyFile.cs");
};
assemblyLoader.RunWorkerAsync();