Update cheatsheets

tldr/cmus

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cmus
+
+> Command-line music player.
+> Use `<ArrowKeys>` to navigate, `<Enter>` to select, and numbers `<1>`-`<8>` switch between different views.
+> See also: `ncmpcpp`, `clementine`, `qmmp`.
+> More information: <https://manned.org/cmus>.
+
+- Open `cmus` into the specified directory (this will become your new working directory):
+
+`cmus {{path/to/directory}}`
+
+- Add file/directory to library:
+
+`<:>add {{path/to/file_or_directory}}`
+
+- Refresh the metadata of songs in the library:
+
+`<:>update-cache`
+
+- Search for songs, albums, or artists:
+
+`</>{{something}}`
+
+- Pause/unpause current song:
+
+`<c>`
+
+- Toggle shuffle mode on/off:
+
+`<s>`
+
+- Quit `cmus`:
+
+`<q>`