Admin/MacOS/App2/README

clarified example settings for Proof General;

Isabelle/JVM application bundle for MacOS
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* http://developer.apple.com/documentation/Java/Conceptual/Java14Development/03-JavaDeployment/JavaDeployment.html

* http://developer.apple.com/documentation/Java/Reference/Java_InfoplistRef/Articles/JavaDictionaryInfo.plistKeys.html#//apple_ref/doc/uid/TP40001969