Code snippets for article BAEL-818 (#1934)

* Quartz example for article: Introduction to Quartz

* Adding new module for Java Quartz

* Removing Quartz code from jee7 module

* Fixing folder structure

* Removing java-quartz module and adding code snippets in libraries module

libraries/src/main/java/com/baeldung/quartz/QuartzExample.java

@@ -0,0 +1,42 @@
+package com.baeldung.quartz;
+
+import org.quartz.JobBuilder;
+import org.quartz.JobDetail;
+import org.quartz.Scheduler;
+import org.quartz.SchedulerException;
+import org.quartz.SchedulerFactory;
+import org.quartz.SimpleScheduleBuilder;
+import org.quartz.Trigger;
+import org.quartz.TriggerBuilder;
+import org.quartz.impl.StdSchedulerFactory;
+
+public class QuartzExample {
+
+    public static void main(String args[]) {
+
+        SchedulerFactory schedFact = new StdSchedulerFactory();
+        try {
+
+            Scheduler sched = schedFact.getScheduler();
+
+            JobDetail job = JobBuilder.newJob(SimpleJob.class)
+                .withIdentity("myJob", "group1")
+                .build();
+
+            Trigger trigger = TriggerBuilder.newTrigger()
+                .withIdentity("myTrigger", "group1")
+                .startNow()
+                .withSchedule(SimpleScheduleBuilder.simpleSchedule()
+                    .withIntervalInSeconds(40)
+                    .repeatForever())
+                .build();
+
+            sched.scheduleJob(job, trigger);
+            sched.start();
+
+        } catch (SchedulerException e) {
+            e.printStackTrace();
+        }
+    }
+
+}

libraries/src/main/java/com/baeldung/quartz/SimpleJob.java

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+package com.baeldung.quartz;
+
+import org.quartz.Job;
+import org.quartz.JobExecutionContext;
+import org.quartz.JobExecutionException;
+
+public class SimpleJob implements Job {
+
+    public void execute(JobExecutionContext arg0) throws JobExecutionException {
+        System.out.println("This is a quartz job!");
+    }
+
+}