Add Dockerfile

Change-Id: I1160c014bca9f4dbff8da2dadcbde5d91eabaef0
diff --git a/example.conf b/example.conf
index a9522d4..a68f5e3 100644
--- a/example.conf
+++ b/example.conf
@@ -1,6 +1,6 @@
 {
   hypnotoad => {
-    listen  => ['http://*:5673'],
+    listen  => ['http://*:3000'],
     trusted_proxies => ['10.0/8', '127.0.0.1'],
     proxy => 1,
     pid_file => 'derekovecs-example.'. `hostname -s | tr -d "\n"` .'.pid',