Adding Score scene

...java/uk/ac/soton/comp1206/event/ScoreUpdatedListener.java

tetrecs/src/main/java/uk/ac/soton/comp1206/game/Game.java

.../main/java/uk/ac/soton/comp1206/scene/ChallengeScene.java

...s/src/main/java/uk/ac/soton/comp1206/scene/MenuScene.java

...src/main/java/uk/ac/soton/comp1206/scene/ScoresScene.java

...ecs/src/main/java/uk/ac/soton/comp1206/ui/ScoresList.java

tetrecs/src/main/resources/style/game.css

tetrecs/target/classes/module-info.class

tetrecs/target/classes/style/game.css

tetrecs/target/classes/uk/ac/soton/comp1206/game/Game.class

...t/classes/uk/ac/soton/comp1206/scene/ChallengeScene.class

...target/classes/uk/ac/soton/comp1206/scene/MenuScene.class