Home was foreclosed, what do I file in the courts to let the new investor know home is in litigation?

You need to go down to the county recorder and record a document called a Lis Pendens. That will notify them about your lawsuit.

I think you are referring to a 'lis pendens.' That is a notice in the real estate records that tells anyone interested that pending litigation may affect the title. You might be able to get a form from a legal stationers, or download it. Check with the Register of Deeds in your County.