Add upstream oh_my_zsh repo

zsh/plugins/dnf/README.md

@@ -1,10 +1,14 @@
-## Description
+# dnf plugin
 
-This plugin makes `dnf` usage easier by adding aliases for the most
-common commands.
+This plugin makes `dnf` usage easier by adding aliases for the most common commands.
 
-`dnf` is the new package manager for RPM-based distributions, which
-replaces `yum`.
+`dnf` is the new package manager for RPM-based distributions, which replaces `yum`.
+
+To use it, add `dnf` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... dnf)
+```
 
 ## Aliases