Add Risk Game listing#271

boxel-submission-bot wants to merge 1 commit intomaincardstack/boxel-catalog:mainfrom

room-IUpvR0RwTXFzWGlCblVhbUhXbzpzdGFjay5jYXJkcw/risk-gamecardstack/boxel-catalog:room-IUpvR0RwTXFzWGlCblVhbUhXbzpzdGFjay5jYXJkcw/risk-gameCopy head branch name to clipboard