cron expression comments

src/main/java/emu/grasscutter/task/Task.java

@@ -6,8 +6,22 @@ import java.lang.annotation.RetentionPolicy;
 
 /*
 * So what is cron expression?
-* second minute hour day month week year
+The format of a Cron expression is as follows.
+Second Minute Hour Day Month Week Year
+Seconds: 0-59
+Minute: 0-59
+hour: 0-23
+Day: 1-31
+Month: 1-12
+Week: 1-7 (0-6 sometimes)
+Year: Specify your own
+
+If you want to express every second or every minute or something like that, use the * symbol in that position;
+if you want to express more than one such as every 15 minutes and every 30 minutes, you can write:`15, 30`.
+
+For the rest of the wildcard characters, please Google them yourself
 */
+
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Task {
     String taskName() default "NO_NAME";