Create usage instructions for windows and linux, allow for custom torrent indexers

Instructions: true
sadly I don't have a windows machine
and someone wanted to write tutorials maybe I can find them and link them

custom torrent indexes: XDM by design can handle any kind of source if an appropriate plugin is given... A few torrent "indexer" plugins have been made and are in external repositories ... Have a look at the wiki page on github

it might not be clear but XDM itself does not handle torrents or nzbs ... Plugins define the type of download and others provide downloads of that type another plugin handles the download of that type therefore it's in XDMs nature to allow custom torrent sites by plugins