GitLab

Add better usage instructions for the plugin which actually work

* Fix the terraform function name

Current function name do worse. I always use `terr<TAB>` and before those prompt it was add space in the end. Now because we have multiple functions and binaries started with terraform there are no space.

* Updated terraform readme

Updated the name of new function name

Expanded Terraform plugin with function that can be used to show workspace name in the zsh prompt