It's legitimate to post this news article, even if the woman's allegations are false. He is running for president and being sued. It is newsworthy. If the suit is dismissed, that news certainly should be posted, as well.
I'm always skeptical about stories such as this, but I must say, that if I were absolutely forced to give an opinion, I'd say he did it, or something close to it. Trump is not the sort of person who inspires me with good feelings pertaining to his moral integrity.
What's more, if this story is true, I can't see it hurting him too much. The kind of people who support Trump are not the sort who care very much about failings like the one in question.