docs: Add READMEs for feh, httpie, and yay

feh/README.md

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+# feh
+
+[feh][feh] is an image viewer with no GUI. It can also change the desktop background.
+
+## Use Cases
+
+feh can be used to:
+
+- Quickly view and browse through images without loading a GUI
+- Change your desktop background if not using a desktop environment
+- Strategically place GUI-less images in your rice screenshots
+
+You should not use feh if:
+
+- You are using a desktop environment with an image viewer
+
+[feh]: https://github.com/derf/feh

httpie/README.md

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+# httpie
+
+[httpie][httpie] is an alternative to curl and wget.
+
+## Use Cases
+
+httpie can be used to:
+
+- View HTTP request and response headers
+- Print, with syntax highlighting, the response body of a URL
+- Download any kind of content from a given URL
+
+You should not use httpie if:
+
+- You are working on a server that already has curl or wget available
+
+[httpie]: https://github.com/jakubroztocil/httpie

yay/README.md

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+# yay
+
+[yay][yay] is an AUR helper for [Arch Linux](/.archlinux).
+
+## Use Cases
+
+yay can be used to:
+
+- Easily check for updates of AUR packages
+- View database statistics with a single command (`-Ps`)
+- Clean unused dependencies easily (`-c`)
+
+You should not use yay if:
+
+- You do not have to worry about updating AUR packages
+
+[yay]: https://github.com/Jguer/yay