add edit button to task page

templates/task.html

@@ -18,12 +18,20 @@
                 <div>
                     <p>Due: {{ task.due_timestamp }}</p>
                 </div>
+                <p>
+                    <a class="btn btn-primary" href="/task/{{task.id}}/edit">Edit Task</a>
+                    <span>
+
+                    </span>
+                </p>
+                <p>
                 <form method="POST"
                       action="{{url_for('delete_task',
                                 task_id=task.id) }}">
-                    <input class="btn btn-danger" type="submit" value="Delete Task"
+                      <input class="btn btn-danger" type="submit" value="Delete Task"
                            onclick="return confirm('Are you sure you want to delete this task?')">
                 </form>
+                </p>
             </div>
     </div>
 {% endblock %}