Added classes for manage authentication and retrieve data to/from fitbit... but the code needs some mods!

src/main/java/manage/UserData.java

@@ -0,0 +1,17 @@
+package manage;
+
+
+import com.google.api.client.util.Key;
+import java.util.List;
+
+public class UserData {
+
+    @Key
+    public List<Data> list;
+/*
+    @Key
+    public int limit;
+
+    @Key("has more")
+    public boolean hasMore;*/ //don't think are needed
+}