Add upstream oh_my_zsh repo

zsh/plugins/codeclimate/README.md

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+# codeclimate plugin
+
+This plugin adds autocompletion for the [`codeclimate` CLI](https://github.com/codeclimate/codeclimate).
+
+To use it, add `codeclimate` to the plugins array in your zshrc file:
+```zsh
+plugins=(... codeclimate)
+```