Added class and os alternates

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

@@ -0,0 +1,9 @@
+# Cpanm
+
+This plugin provides completion for [Cpanm](https://github.com/miyagawa/cpanminus) ([docs](https://metacpan.org/pod/App::cpanminus)).
+ 
+To use it add cpanm to the plugins array in your zshrc file.
+ 
+ ```bash
+plugins=(... cpanm)
+```