No idea how to get this to work

The readme has this:
{
"Say hello to the world": {
"prefix": ["hw", "hello"],
"body": "Hello, ${1:world}!$0"
}
}

Where does this go? A file in ~/.config/nvim/lua/config/snippets? What's the filename? Is that all that goes in the file? I'm using a mostly vanilla lazyVim setup and this plugin is included.

Start with the README section containing the snippet and review the questions about the configuration directory, filename, and file contents. Document the setup path for a mostly vanilla LazyVim installation, including where the snippet belongs and what a complete file should contain. Done means a new user can follow the README without needing the issue thread.

Written by the indexing model from the issue text.