docs: adding subject and main

subjects/java/checkpoints/time-tracker/ExerciseRunner.java

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+public class ExerciseRunner {
+    public static void main(String[] args) {
+        // Example of a very short project
+        ProjectTime shortProject = new ProjectTime("2023-05-14 09:00", "2023-05-14 09:30");
+        System.out.println("Short Project Total Logged Time: " + shortProject.getHoursLogged());  // Should be "30 m"
+
+        // Example of an overnight project
+        ProjectTime overnightProject = new ProjectTime("2023-05-14 20:00", "2023-05-15 08:00");
+        System.out.println("Overnight Project Total Logged Time: " + overnightProject.getHoursLogged());  // Should be "12 h"
+
+        // Example of a full day project
+        ProjectTime fullDayProject = new ProjectTime("2023-05-14 00:00", "2023-05-15 00:00");
+        System.out.println("Full Day Project Total Logged Time: " + fullDayProject.getHoursLogged());  // Should be "24 h"
+
+        // Example with incorrect format
+        ProjectTime errorProject = new ProjectTime("2023-05-14", "2023-05-15 08:00");
+        System.out.println("Error Project Total Logged Time: " + errorProject.getHoursLogged());  // Should handle error or indicate incorrect format
+    }
+}

subjects/java/checkpoints/time-tracker/README.md

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+## TimeTracker
+
+### Instructions
+
+Write a `ProjectTime` class to track the duration of a project using start and end times. You will be asked to add getter and setter methods for the `startTime` and `endTime` attributes. When you set one of them, you must update the `hoursLogged` attribute. The `hoursLogged` getter should output the hours in the following format:
+
+- Less than 120 minutes: `hoursLogged` minutes
+- Less than 120 hours: `hoursLogged` hours
+- Less than 120 days: `hoursLogged` days
+- More than 120 days: `hoursLogged` months
+
+If there is any error, the number of `hoursLogged` should be handled accordingly.
+
+> 💡 The `hoursLogged` shouldn't be a negative number except -1 in case of errors.
+
+### Expected Functions
+
+```java
+public class ProjectTime {
+    private String startTime;
+    private String endTime;
+    private float hoursLogged;
+
+    public ProjectTime(String start, String end);
+
+    public void setStartTime();
+    public void setEndTime();
+
+    public String getStartTime();
+    public String getEndTime();
+
+    public String getHoursLogged();
+}
+```
+
+### Usage
+
+Here is a possible `ExerciseRunner.java` to test your function :
+
+```java
+public class ExerciseRunner {
+    public static void main(String[] args) {
+        // Example of a very short project
+        ProjectTime shortProject = new ProjectTime("2023-05-14 09:00", "2023-05-14 09:30");
+        System.out.println("Short Project Total Logged Time: " + shortProject.getHoursLogged());  // Should be "30 m"
+
+        // Example of an overnight project
+        ProjectTime overnightProject = new ProjectTime("2023-05-14 20:00", "2023-05-15 08:00");
+        System.out.println("Overnight Project Total Logged Time: " + overnightProject.getHoursLogged());  // Should be "12 h"
+
+        // Example of a full day project
+        ProjectTime fullDayProject = new ProjectTime("2023-05-14 00:00", "2023-05-15 00:00");
+        System.out.println("Full Day Project Total Logged Time: " + fullDayProject.getHoursLogged());  // Should be "24 h"
+
+        // Example with incorrect format
+        ProjectTime errorProject = new ProjectTime("2023-05-14", "2023-05-15 08:00");
+        System.out.println("Error Project Total Logged Time: " + errorProject.getHoursLogged());  // Should handle error or indicate incorrect format
+    }
+}
+```
+
+and its output :
+
+```shell
+$ javac *.java -d build
+$ java -cp build ExerciseRunner
+Short Project Total Logged Time: 30 m
+Overnight Project Total Logged Time: 12 h
+Full Day Project Total Logged Time: 24 h
+Error Project Total Logged Time: -1
+$
+```