Question: how to use resources for prompts?

[github-gregory-bougeard]

Hi, it's more a question than an issue but I'd like to know how to efficiently use resources for prompts.

My idea is to expose markdown files for prompts as resources. and to combine (or not) those resources to expose a prompt.
My markdown files might be templated (need to replace some parameters coming from the prompt request).

Is the following a way to go:

let uri = "prompt:///my_prompt";
let messages = vec![PromptMessage::new_resource(
                    PromptMessageRole::User,
                    uri,
                )];

                Ok(GetPromptResult {
                    description: Some(format!(
                        "Prompt using my input",
                        my_input,
                    )),
                    messages,
                })

I am not sure about how to use PromptMessage::new_resource and if it is a good idea to process this way. Would you mind adding some examples of its usage? (Maybe add an example while resolving #337 ?)

Thanks a lot.