Add base cmus.md help file

help/cmus.md

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+# cmus
+
+## Music Playback
+
+- Play the current song from the beginning: `enter`
+- Resume the current song: `x`
+- Pause the current song: `c`
+- Go to the next song: `b`
+- Go to the previous song: `z`
+- Toggle shuffle: `s`
+- Shuffle between artist, album, or all: `m`
+
+## Navigating
+
+- Jump to the current playing song in the cmus view: `i`
+- Switch between columns: `tab`
+- Basic navigation: `hjkl`
+- Search for a particular song: `/`
+    - Go to the next search result: `n`
+    - Go to the previous search result: `N`
+- View the sorted library: `2`
+- View the file browser: `5`
+- Add the highlighted song to the queue of songs to play: `e`
+
+## Volume
+
+- Increase the volume by 10%: `+`
+- Decrease the volume by 10%: `-`