add post module based on @zeroSteiner idea for enumerating patches on Windows

basic module just pulls list of KBs and parses them.
Yeah, Windows Gather Applied Patches. The reason Gather should be there is because it's under the "gather" directory. If you want the word enumeration in there, you can. It would be like: Windows Gather Applied Patches Enumeration... I don't know if that sounds right for you, but some modules do name it like that.