Updated README.md

Author: Lewiscowles1986

README.md

@@ -1,2 +1,19 @@
 # docker-jdk
+
 Using docker to provide multiple python runtimes, for use with CD2 internal build systems
+
+[![Build Status](https://travis-ci.org/CODESIGN2/docker-jdk.svg?branch=master)](https://travis-ci.org/CODESIGN2/docker-jdk)
+
+## Using
+
+Probably best to build using your own derrived image. This was done as an experiment to deepen & evidence Jenkins CI expertise. 
+
+It's used internally, but will maybe be revisited 1-2 times per-year.
+
+No public real-world usage currently exists, but [open an issue](./issues) if you want to be the first. Reading through [php-ulid](https://github.com/Lewiscowles1986/php-ulid/blob/3358ae90d67474ddf9ce96753110459136b9eb76/Jenkinsfile) you should get an idea for the parts involved.
+
+You don't need to run multiple runtimes in parallel, but it cuts down time testing, and can be used as a roadmapping tool.
+
+## Notes / Troubleshooting
+
+- Not all dependencies will be available for all platforms. 1.x is either EOL or expected to soon. EOL runtimes will be available on dockerhub, but removed from the travis.yml.