docs: Add READMEs for kitty, xcursor, and xinit

kitty/README.md

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+# kitty
+
+[kitty][kitty] is a new terminal emulator built from the ground up to support all modern terminal features.
+
+## Use Cases
+
+kitty can be used to:
+
+- View images in the terminal, without the visual inconsistencies of w3m
+- Change background opacity on the fly (without opening a new terminal)
+- View emoji and other special symbols in the terminal
+- View all icon fonts in the terminal
+- Change the entire color scheme on the fly (both the terminal and kitty itself)
+- Display over 16 million different colors at the same time (also known as 24-bit true color support)
+
+You should not use kitty if:
+
+- You should use kitty.
+
+[kitty]: https://github.com/kovidgoyal/kitty

xcursor/README.md

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+# xcursor
+
+[xcursor][xcursor] is used to choose the X11 cursor theme.
+
+## Use Cases
+
+xcursor can be used to:
+
+- Set the X cursor independent of the GUI toolkit being used
+- Set the X cursor for programs that don't use a GUI toolkit
+
+You should not use xcursor if:
+
+- You are using a desktop environment that manages cursor settings for you
+
+[xcursor]: https://wiki.archlinux.org/index.php/Cursor_themes

xinit/README.md

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+# xinit
+
+[xinit][xinit] is used to run the X display server with `startx`.
+
+## Use Cases
+
+xinit can be used to:
+
+- Start X from a tty
+
+You should not use xinit if:
+
+- You use a display manager that bypasses the tty
+
+[xinit]: https://wiki.archlinux.org/index.php/Xinit