Add Quartz Scheduler support

See gh-4299

spring-boot-samples/spring-boot-sample-quartz/src/main/java/sample/quartz/SampleJob.java

@@ -0,0 +1,20 @@
+package sample.quartz;
+
+import org.quartz.JobExecutionContext;
+import org.quartz.JobExecutionException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.scheduling.quartz.QuartzJobBean;
+
+public class SampleJob extends QuartzJobBean {
+
+	private static final Logger LOGGER = LoggerFactory.getLogger(SampleJob.class);
+
+	@Override
+	protected void executeInternal(JobExecutionContext context)
+			throws JobExecutionException {
+		LOGGER.info("Hello {}!", context.getJobDetail().getKey());
+	}
+
+}