docs: Add READMEs for gtk, wal, xresources, and yt-dl

gtk/README.md

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+# gtk-settings
+
+[GTK][gtk] is the widget toolkit used by Firefox, Electron, and many (if not all) GNOME applications.
+
+GTK's `settings.ini` only affects window managers and not the GNOME desktop environment. This is because GNOME manages user preferences with [`dconf` through `gsettings`][gnome].
+
+## Use Cases
+
+gtk-settings can be used to:
+
+- Control the appearance of GTK applications under non-GNOME environments
+
+You do not need to use gtk-settings if:
+
+- You are using the GNOME desktop environment
+
+[gtk]: https://wiki.archlinux.org/index.php/GTK+
+[gnome]: https://wiki.archlinux.org/index.php/GNOME#Configuration

wal/README.md

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+# pywal
+
+[pywal][pywal] is a universal color scheme changer.
+
+## Use Cases
+
+pywal can be used to:
+
+- Generate a color scheme from a given image
+- Choose from a set of pre-defined color schemes
+- Load your own color schemes
+- Apply a color scheme to all the programs you use with a single command
+
+You should not use pywal if:
+
+- You use a desktop environment and don't mind the default look and feel of applications
+
+[pywal]: https://github.com/dylanaraps/pywal

xresources/README.md

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+# xresources
+
+[xresources][xresources] is used to configure X settings outside of desktop environments.
+
+## Use Cases
+
+xresources can be used to:
+
+- Set the font settings for low-level X applications
+- Change the DPI of the X instance
+
+You do not need xresources if:
+
+- You are using a desktop environment that handles X or higher-level settings for you
+- You are not using X
+
+[xresources]: https://wiki.archlinux.org/index.php/X_resources

yt-dl/README.md

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+# yt-dl
+
+[yt-dl][yt-dl] is a media downloading program.
+
+## Use Cases
+
+yt-dl can be used to:
+
+- Download video from a given URL
+- Stream video to programs like mpv
+
+You should not use yt-dl if:
+
+- You should use yt-dl.
+
+[yt-dl]: https://github.com/rg3/youtube-dl