Initial setup of the Java Integration guide for the website

Created a guide per the Java integration ReadMe
Added the Maven Central artifact information

Future updates: 
Need functional tests for a Java Maven project and a Java Gradle project
The JRuby runtime dependency is missing
Maybe provide an example of the array output
Possibly add callouts to the builder code example, directory walker code example
Code example of JRuby and Java flags being used?

Resolves #32