Add demo-app autoscaling group

modules/app/resources/bootstrap.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+yum update -y
+amazon-linux-extras install docker
+service docker start
+usermod -a -G docker ec2-user
+chkconfig docker on
+
+docker run \
+  -p 80:80 \
+  --restart unless-stopped \
+  nginxdemos/hello