Update DeveloperManual.md
Update DeveloperManual.md
TeamSerenity/Lokaverkefni-Tic-Tac-Toe,TeamSerenity/Lokaverkefni-Tic-Tac-Toe,TeamSerenity/Lokaverkefni-Tic-Tac-Toe,TeamSerenity/Lokaverkefni-Tic-Tac-Toe