Add additional information for Java package build

Change-Id: I362a85049e43c4160c9b24fa8180bcae445986db

Wrapping/Java/README.txt

+In order to build the JOGL rendering classes, you will need to have JOGL
+libraries installed on your system. For that you can use Maven to download
+for you the proper JARs.
+
+For that you can run the following command lines:
+
+$ mvn org.apache.maven.plugins:maven-dependency-plugin:2.1:get
+   -DrepoUrl=http://download.java.net/maven/2/
+   -Dartifact=org.jogamp.gluegen:gluegen-rt:2.0.2
+
+$ mvn org.apache.maven.plugins:maven-dependency-plugin:2.1:get
+   -DrepoUrl=http://download.java.net/maven/2/
+   -Dartifact=org.jogamp.jogl:jogl-all-main:2.0.2
+
+$ mvn org.apache.maven.plugins:maven-dependency-plugin:2.1:get
+   -DrepoUrl=http://download.java.net/maven/2/
+   -Dartifact=org.jogamp.jogl:jogl-all:2.0.2