Add upstream oh_my_zsh repo

zsh/plugins/pow/README.md

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+# pow plugin
+
+This plugin adds completion and commands for [pow](http://pow.cx/), a
+zero-configuration Rack server for macOS.
+
+To use it, add pow to the plugins array of your zshrc file:
+
+```sh
+plugins=(... pow)
+```
+
+## Commands
+
+- `kapow` will restart an app.
+
+  ```bash
+  kapow myapp
+  ```
+
+- `kaput` will show the standard output from any pow app.
+- `repow` will restart the pow process.