docs: adding subject and main

subjects/java/checkpoints/todo-list/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        TodoList myList = new TodoList(3); // List can hold up to 3 tasks
+        myList.addTask("Go grocery shopping");
+        myList.addTask("Pay electricity bill");
+        myList.setStatus(0, TaskStatus.COMPLETED); // Mark the first task as completed
+        myList.setDescription(1, "Pay all utility bills"); // Update the description of the second task
+        myList.displayTasks(); // Display the list of tasks
+    }
+}

subjects/java/checkpoints/todo-list/README.md

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+## TodoList
+
+### Instructions
+
+Write a class `Task` that has two attributes: `description` and `status`, with the corresponding getters and setters.
+
+Write a class called `TodoList` that represents a to-do list. The class should be able to hold a specified number of tasks, each with a description and a status. Include methods to add tasks, set a task's status, update task descriptions, and display all tasks in a neat format showing their descriptions and statuses.
+
+### Expected Functions
+
+```java
+enum TaskStatus {
+    NEW, IN_PROGRESS, COMPLETED
+}
+
+public class Task {
+    private String description;
+    private TaskStatus status;
+
+    public void setDescription(String description);
+    // Getters and Setters
+    // ...
+}
+
+public class TodoList {
+    private Task[] tasks;
+    private int capacity;
+
+    public TodoList(int capacity);
+
+    public void addTask(String description);
+
+    public void setStatus(int index, TaskStatus status);
+
+    public void setDescription(int index, String newDescription);
+
+    public void displayTasks();
+}
+```
+
+### Usage
+
+Here is a possible TaskManager.java to test your TodoList class:
+
+```java
+public class ExerciseRunner {
+    public static void main(String[] args) {
+        TodoList myList = new TodoList(3); // List can hold up to 3 tasks
+        myList.addTask("Go grocery shopping");
+        myList.addTask("Pay electricity bill");
+        myList.setStatus(0, TaskStatus.COMPLETED); // Mark the first task as completed
+        myList.setDescription(1, "Pay all utility bills"); // Update the description of the second task
+        myList.displayTasks(); // Display the list of tasks
+    }
+}
+```
+
+and its output:
+
+```shell
+$ javac TaskList.java TaskManager.java
+$ java TaskManager
+Tasks:
+Go grocery shopping               | COMPLETED
+Pay all utility bills             | NEW
+```