Add missing commands

Excerpt from the node-client's README:

> - `tldr --linux <command>` show command page for Linux
> - `tldr  --osx <command>` show command page for OSX
> - `tldr --sunos <command>` show command page for SunOS
> - `tldr --list` show all pages for current platform
> - `tldr --list-all` show all available pages
