gistfile1.cs

var workspace = new AdhocWorkspace();

string projName = "NewProject";
var projectId = ProjectId.CreateNewId();
var versionStamp = VersionStamp.Create();
var projectInfo = ProjectInfo.Create(projectId, versionStamp, projName, projName, LanguageNames.CSharp);
var newProject = workspace.AddProject(projectInfo);
var sourceText = SourceText.From("class A {}");
var newDocument = workspace.AddDocument(newProject.Id, "NewFile.cs", sourceText);

foreach (var project in workspace.CurrentSolution.Projects)
{
	foreach (var document in project.Documents)
	{
		Console.WriteLine(project.Name + "\t\t\t" + document.Name);
	}
}