qmmp: add page (#9509)

pages/common/qmmp.md

@@ -0,0 +1,32 @@
+# qmmp
+
+> An audio player.
+> More information: <http://qmmp.ylsoftware.com>.
+
+- Launch qmmp:
+
+`qmmp`
+
+- Start or stop the currently playing audio:
+
+`qmmp --play-pause`
+
+- Seek forwards or backward a specific amount of time in seconds:
+
+`qmmp --seek-{{fwd|bwd}} {{time_in_seconds}}`
+
+- Play the next audio file:
+
+`qmmp --next`
+
+- Play the previous audio file:
+
+`qmmp --previous`
+
+- Print the current volume:
+
+`qmmp --volume-status`
+
+- Increase or decrease the volume of the currently playing audio by 5 steps:
+
+`qmmp --volume-{{inc|dec}}`