Added: Antietam Battlefield Tour app

Antietam Battlefield -- "The Antietam Battlefield Tour application provides users with video and audio content that allows them to explore the history of the location. The content is triggered by GPS and new content is displayed as tourists make their way along the 13-stop tour. Tourists will be able to listen to the stories of the men and women that were part of the battle and see visual depictions of the battle’s defining moments."