WRT adding this file, this PR still doesn't address the requirements for complying with the license. I think these can more or less be satisfied by including a NOTICE file that includes the text:
>  This product includes software developed at The Apache Software Foundation (http://www.apache.org/).

But it might be the case that some other JBoss/Red Hat attribution might want to live in that file as well just to avoid giving the impression that _all_ of Roaster is ASF-developed. Perhaps there is another AL JBoss project that has a NOTICE file we could crib from?