Add upstream oh_my_zsh repo

zsh/plugins/thor/README.md

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+# Thor plugin
+
+This plugin adds completion for [Thor](http://whatisthor.com/), 
+a ruby toolkit for building powerful command-line interfaces.
+
+To use it, add `thor` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... thor)
+```