docs: Add READMEs for ncmpcpp, ranger, and rofi

ncmpcpp/README.md

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+# ncmpcpp
+
+[ncmpcpp][ncmpcpp] is a music player client for the terminal.
+
+## Use Cases
+
+ncmpcpp can be used to:
+
+- Manage your entire music library from a pretty terminal interface
+- Let your music player have a color scheme consistent to your setup
+- Add music functionality in your rice screenshot
+
+You should not use ncmpcpp if:
+
+- You use a desktop environment that already has a music player
+- You do not want to use mpd
+
+[ncmpcpp]: https://github.com/arybczak/ncmpcpp

ranger/README.md

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+# ranger
+
+[ranger][ranger] is a file browser for the terminal with image support.
+
+## Use Cases
+
+ranger can be used to:
+
+- Easily see all filenames in directories as you browse through them
+- Show image previews in the terminal (with [kitty](/kitty))
+- Use a file browser even through a tty
+
+You should not use ranger if:
+
+- You should use ranger.
+
+[ranger]: https://github.com/ranger/ranger

rofi/README.md

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+# rofi
+
+[rofi][rofi] is an application launcher, window switcher, and dmenu replacement.
+
+## Use Cases
+
+rofi can be used to:
+
+- Launch applications based on `.desktop` files
+- Show all open windows and switch between them
+- Parse dmenu-like input
+
+You should not use rofi if:
+
+- Your desktop environment already has an application launcher and window switcher
+
+[rofi]: https://github.com/DaveDavenport/rofi