Upgrade snap-shot in Windows

Hi @vossivossi, @maze and @davorf, I noticed these posts and whilst I have very little experience with openHAB and Windows I wanted to address your concerns. No documentation existed previously because no one from the community contributed to it. I have read a few posts and collected the information on the docs website:

http://docs.openhab.org/installation/windows.html

I’m sure there are a many number of things missing, so please feel free to add to it, by contributing or discussing issues here: