Display installation command for LLM CLI Set if not installed locally

[devleejb]

What would you like to be added?

Currently, when a user runs a command for the LLM CLI Set but does not have it installed locally, an error message is displayed indicating that the command is not recognized.

To improve the user experience, it would be helpful to provide information about the LLM CLI Set and how to install it, including the installation command. This can be displayed when the user runs a command for the LLM CLI Set without having it installed.

Why is this needed?

1. Improve user experience: By providing the installation command and instructions, users who are not familiar with the LLM CLI Set can easily install it and start using it.
2. Reduce confusion: Instead of displaying an error message that the command is not recognized, providing installation instructions upfront can prevent confusion and guide users in the right direction.