public static ClassDeclarationSyntax AddConstructor(this ClassDeclarationSyntax currentClass)
{
var identifer = currentClass.DescendantTokens()
.First(t => t.IsKind(SyntaxKind.IdentifierToken) && t.Parent.Kind() == SyntaxKind.ClassDeclaration);
var constructorBase = "public " + identifer.Text + "(){}";
var methodSyntax = CSharpSyntaxTree.ParseText(constructorBase);
var method = methodSyntax.GetRoot().DescendantNodes().OfType <MethodDeclarationSyntax>().First();
currentClass = currentClass.AddMembers(method);
return(currentClass);//.(methodSyntax.GetRoot().SyntaxTree;);
}