put tasks into one package

src/main/java/Dukey.java

@@ -1,3 +1,8 @@
+
+
+import Tasks.*;
+import dukey.*;
+
 import java.util.ArrayList;
 import java.util.Scanner;
 

src/main/java/Deadline.java → src/main/java/Tasks/Deadline.java

@@ -1,3 +1,6 @@
+package Tasks;
+
+import Tasks.Task;
 
 public class Deadline extends Task {
     private String due;

src/main/java/Event.java → src/main/java/Tasks/Event.java

@@ -1,3 +1,7 @@
+package Tasks;
+
+import Tasks.Task;
+
 public class Event extends Task {
     private String from;
     private String by;

src/main/java/Task.java → src/main/java/Tasks/Task.java

@@ -1,3 +1,5 @@
+package Tasks;
+
 public class Task {
     protected String description;
     protected boolean isDone;

src/main/java/Todo.java → src/main/java/Tasks/Todo.java

@@ -1,3 +1,7 @@
+package Tasks;
+
+import Tasks.Task;
+
 public class Todo extends Task {
     public Todo(String description) {
         super(description);

src/main/java/DukeyException.java → src/main/java/dukey/DukeyException.java

@@ -1,3 +1,5 @@
+package dukey;
+
 public class DukeyException extends Exception {
     public DukeyException(String message){
         super(message);