peerflix: adds page (#1457)

pages/common/peerflix.md

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+# peerflix
+
+> Stream video or audio based torrents to your favorite player.
+
+- Stream a torrent:
+
+`peerflix "{{magnet:?xt=urn:btih:00112233445566}}"`
+
+- Stream a torrent to VLC:
+
+`peerflix "{{torrent url|magnet link}}" --vlc`
+
+- Stream all files from a torrent to Airplay:
+
+`peerflix "{{torrent url|magnet link}}" --all --airplay`