Added class and os alternates

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

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+# taskwarrior
+
+This plugin adds smart tab completion for [TaskWarrior](https://taskwarrior.org/).
+It uses the zsh tab completion script (`_task`) shipped with TaskWarrior for the
+completion definitions.
+
+The latest version pulled in from the official project is of January 1st, 2015.
+
+
+## Examples
+
+Typing `task [TAB]` will give you a list of commands, `task 66[TAB]` shows a
+list of available modifications for that task, etcetera.