Updated package structure to make separation for testing clearer.

src/main/java/com/cm6123/monopoly/app/package-info.java

 /**
  * Contains console classes for the user interface.
+ * You do not need to write automated tests of classes/methods in this package.
+ * DO NOT HIDE business logic in this package.
  */
 package com.cm6123.monopoly.app;

src/main/java/com/cm6123/monopoly/game/package-info.java

+/**
+ * This package contains the main game logic.
+ * This is the package root that should be subjected to automated testing.
+ * It should not have any user interface code in it.
+ */
+package com.cm6123.monopoly.game;
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