Added link to official VR module forum thread

[Pesegato]

No description provided.

[mitm001]

see post,
https://hub.jmonkeyengine.org/t/official-vr-module/37830/73

[mitm001]

This is asciidoctor format not html so you need to format the link like so,
link:url[label]

i.e.
link:https://hub.jmonkeyengine.org/t/official-vr-module/37830/67 [https://hub.jmonkeyengine.org/t/official-vr-module/37830/67 ]

but a better way would be,
Please see this link:https://hub.jmonkeyengine.org/t/official-vr-module/37830/67[forum post] for additional information on JME VR.

[Ali-RS]

I was not able to modify your commit with the proper description from mitm001.
So I made a new commit. See #83
I think we can close this pr.