playerctl: add page (#1997)

pages/linux/playerctl.md

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+# playerctl
+
+> Utility to control different media players.
+
+- Toggle play:
+
+`playerctl play-pause`
+
+- Next media:
+
+`playerctl next`
+
+- Previous media:
+
+`playerctl previous`
+
+- List all players:
+
+`playerctl --list-all`
+
+- Send a command to a specific player:
+
+`playerctl --player={{player_name}} {{command}}`
+
+- Send a command to all players:
+
+`playerctl --all-players {{command}}`