Implementing Delete course method in main

src/main/java/org/example/Main.java

@@ -35,6 +35,7 @@ public class Main {
                     break;
                 case 4:
                     System.out.println("Delete Course selected");
+                    Course.deleteCourse("courseData.txt");
                     break;
                 case 5:
                     System.out.println("Assign Grade selected");