Add zsh/oh my zsh/w10k

zsh/.oh-my-zsh/plugins/nyan/README.md

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+# Nyan plugin
+
+This plugin adds a command to display [Nyan Cat](https://en.wikipedia.org/wiki/Nyan_Cat) right inside your terminal.
+
+**Plugin is deprecated**. Check [official repo](https://github.com/klange/nyancat) for more information.

zsh/.oh-my-zsh/plugins/nyan/nyan.plugin.zsh

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+print -Pn '%F{yellow}'
+cat >&2 <<-EOD
+	nyan plugin:
+	The nyancat server used by this plugin was shut down due to increased
+	bandwidth costs, so the nyan plugin no longer works. You can get the
+	same functionality in some distributions by installing the nyancat package,
+	or you can compile it yourself.
+	See https://github.com/klange/nyancat for more information.
+EOD
+print -Pn '%f'