Add a completion plugin for minishift

plugins/minishift/README.md

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+# minishift
+
+This plugin provides completion for [minishift](https://github.com/minishift/minishift/).
+
+To use it, add `minishift` to the plugins array in your .zshrc file.
+
+```
+plugins=(... minishift)
+```

plugins/minishift/minishift.plugin.zsh

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+# Autocompletion plugin for minishift.
+
+if [ $commands[minishift] ]; then
+  source <(minishift completion zsh)
+fi