Improve guidance for examples & tests

[ejm554]

It took me a few tries to figure out how to run the Lua files in the examples directory. I think some adjustments could have avoided this. I wonder if other people had a similar experience or weren't able to figure it out outright. Here's what I learned by trial & error:

1. I needed to download the entire set of directories on GitHub, i.e., remodel-master.

2. I needed a temp directory in remodel-master to avoid an error, such as the following.

   

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Here are a few ideas that might help:

1. Explicitly explain in the README or somewhere else what a person should do to prepare their device to run the example scripts. For example, "To try the example scripts, download the entire repository to a location on your device, such as your C: drive."

2. Instruct the user to create an empty temp directory or (if possible) include this directory in the repository so it doesn't need to be created. (If tests/scripts.rs is designed to do this for the user, then explain what the user needs to do to run this file, e.g., install Rust, and how/when they should run it.)

3. Adjust the error message(s) to provide additional detail. For example:

   The system cannot find the path specified ("C:\remodel-master\temp\")

4. A walk-through tutorial would also be nice-to-have, but it's understandable that the effort required to do this may not be available. Not yet anyway.