Improve simpletest by adding some sample data

[makermelissa]

With this being its own library, users are starting to use this, so it would be nice to have users be able to see an example in action.

[jposada202020]

@makermelissa could a json example file in the library works, and getting data from it?

[makermelissa]

Basically yes, but I was also thinking something a little more substantial than the current example such as something that iterates through the data.