webtorrent: add page (#2659)

pages/common/webtorrent.md

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+# webtorrent
+
+> The command line interface for WebTorrent.
+> Supports magnets, urls, info hashes and .torrent files.
+
+- Download a torrent:
+
+`webtorrent download "{{torrent_id}}"`
+
+- Stream a torrent to VLC media player:
+
+`webtorrent download "{{torrent_id}}" --vlc`
+
+- Stream a torrent to a Digital Living Network Alliance (DLNA) device:
+
+`webtorrent download "{{torrent_id}}" --dlna`
+
+- Display a list of files for a specific torrent:
+
+`webtorrent download "{{torrent_id}}" --select`
+
+- Specify a file index from the torrent to download:
+
+`webtorrent download "{{torrent_id}}" --select {{index}}`
+
+- Seed a specific file or directory:
+
+`webtorrent seed {{path/to/file_or_directory}}`
+
+- Create a new torrent file for the specified file path:
+
+`webtorrent create {{path/to/file}}`
+
+- Display information for a magnet uri or .torrent file:
+
+`webtorrent info {{path/to/file_or_magnet}}`