MultipleChoiceFragment added

KvizClient/app/build.gradle

...ient/app/src/main/java/onlab/kvizclient/GameActivity.java

...ent/app/src/main/java/onlab/kvizclient/LobbyActivity.java

...rc/main/java/onlab/kvizclient/MultipleChoiceFragment.java

KvizClient/app/src/main/res/layout/activity_game.xml

...ient/app/src/main/res/layout/fragment_multiple_choice.xml

KvizServer/app/src/main/assets/multiple.txt

...rver/app/src/main/java/onlab/kvizserver/GameActivity.java

...n/java/onlab/kvizserver/model/MultipleChoiceQuestion.java

KvizServer/app/src/main/res/layout/activity_game.xml