Merge pull request #61 from cisagov/documentation/add-ports-section

Add a section to the README for ports

README.md

@@ -155,6 +155,17 @@ Hub for a list of all the supported tags.
 |-------------|----------------|
 | `/var/log`  |  Log storage   |
 
+## Ports ##
+
+The following ports are exposed by this container:
+
+| Port | Purpose        |
+|------|----------------|
+| 8080 | Example only; nothing is actually listening on the port |
+
+The sample [Docker composition](docker-compose.yml) publishes the
+exposed port at 8080.
+
 ## Environment variables ##
 
 ### Required ###