[ADD] all classes and packages according to class diagram

app/src/main/java/com/a1/nextlocation/data/Coupon.java

@@ -0,0 +1,4 @@
+package com.a1.nextlocation.data;
+
+public class Coupon {
+}

app/src/main/java/com/a1/nextlocation/data/Data.java

@@ -0,0 +1,4 @@
+package com.a1.nextlocation.data;
+
+public class Data {
+}

app/src/main/java/com/a1/nextlocation/data/FileIO.java

@@ -0,0 +1,4 @@
+package com.a1.nextlocation.data;
+
+public class FileIO {
+}

app/src/main/java/com/a1/nextlocation/data/Location.java

@@ -0,0 +1,4 @@
+package com.a1.nextlocation.data;
+
+public class Location {
+}

app/src/main/java/com/a1/nextlocation/data/Route.java

@@ -0,0 +1,4 @@
+package com.a1.nextlocation.data;
+
+public class Route {
+}