Add upstream oh_my_zsh repo

zsh/plugins/yii/README.md

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+# Yii plugin
+
+The plugin adds autocomplete commands and subcommands for [yii](https://www.yiiframework.com/).
+
+To use it, add `yii` to the plugins array of your zshrc file:
+
+```zsh
+plugins=(... yii)
+```
+
+## Aliases
+
+| Alias  | Command              |
+|--------|----------------------|
+| yiic   | `protected/yiic`     |