“I have always depended on the kindness of strangers,” is absolutely something William Shuman need never worry about when he is on stage performing “En Avant! An Evening with Tennessee Williams,” a new solo show presented as part of the NY International Fringe Festival. Mr. Shuman also penned the eighty-five minute piece with sensible and enlightening information about the idiosyncratic and fascinating author and playwright. He presents Tennessee Williams with style and grace