Code example for article BAEL-818 (#1909)

* Quartz example for article: Introduction to Quartz

* Adding new module for Java Quartz

* Removing Quartz code from jee7 module

* Fixing folder structure

java-quartz/src/main/java/com/baeldung/java_quartz/SimpleJob.java

@@ -0,0 +1,13 @@
+package com.baeldung.java_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!");
+    }
+
+}