archlinux: add package managers

wiki/linux/arch-linux/package-manager.md

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+# Package Manager
+
+Package managers are important programs to get software onto your system.
+In Arch Linux there are 2 main package managers.
+One is `pacman`, the default package manager.
+But there are also a bunch other managers for the Arch User Repositories (AUR).
+
+In this article I'll use `yay` as my go to AUR manager.
+`yay` is also a wrapper for `pacman` so you can just use `yay` instead of pacman
+to install programs.
+
+## Bugfixes
+
+### Error while importing keys
+
+Both `yay` and `pacman` use gpg keys to confirm the package manager gets the
+right package.
+It is possible that it runs into errors when importing new keys.
+If this happens you should try to restart your gpg key server with
+`gpgconf --kill all`.