mpc: add page

pages/common/mpc.md

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+# mpc
+
+> Music Player Client.
+> Program for controlling Music Player Daemon (MPD).
+
+- Toggle between play and pause:
+
+`mpc toggle`
+
+- Stop playing:
+
+`mpc stop`
+
+- Show information about currently playing song:
+
+`mpc status`
+
+- Play next song:
+
+`mpc next`
+
+- Play previous song:
+
+`mpc prev`
+
+- Seek playing song:
+
+`mpc [+-]{{seconds}}`