Add cmus page

pages/linux/cmus.md

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+# cmus
+
+> Commandline C* Music Player.
+> Arrow keys to navogate, `<enter/return>` to select, numbers 1-8 switch between different views.
+
+- Open cmus from specified directory:
+
+`cmus {{path/to/directory}}`
+
+- Add file/directory to library:
+
+`:add {{/path/to/file_or_directory}}`
+
+- Pause/unpause current song:
+
+`c`
+
+- Toggle shuffle:
+
+`s`
+
+- Close cmus:
+
+`q`