docs: Add READMEs for bspwm, polybar, and rtv

bspwm/README.md

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+# bspwm
+
+[bspwm][bspwm] is a tiling window manager for X11.
+
+## Use Cases
+
+bspwm can be used to:
+
+- Automatically tile all kinds of windows, maximizing screen estate
+- Have complete control of your window manager through simple shell commands
+- Minimize resource usage; bspwm works best without a desktop environment
+
+You should not use bspwm if:
+
+- You are using a desktop environment
+- You just want to open multiple shells (use [kitty](/kitty) or [tmux](/tmux) for this instead)
+
+[bspwm]: https://github.com/baskerville/bspwm

polybar/README.md

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+# polybar
+
+[polybar][polybar] is an information panel for your desktop.
+
+## Use Cases
+
+polybar can be used to:
+
+- Show the current desktop, empty desktops, and occupied desktops
+- Show the date, time, volume, CPU statistics, and other information
+- Show the current playing song or anything else you want
+
+You should not use polybar if:
+
+- You already use a desktop environment that has an information panel
+
+[polybar]: https://github.com/jaagr/polybar

rtv/README.md

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+# rtv
+
+[rtv][rtv] is a reddit browser for your terminal.
+
+## Use Cases
+
+rtv can be used to:
+
+- Ignore busy images or other media and focus on the content
+- Always have a reddit theme consistent with your setup
+- Use reddit without leaving the terminal, even through ttys
+
+You should not use rtv if:
+
+- You don't use reddit
+
+[rtv]: https://github.com/michael-lazar/rtv