We don't have great docs on the store file - we should create a docs/STORE_FILE.md that explains in details the components of the store file, how it can be used and with which commands and reflect the change in this PR.

The README should link to this file whenever it is discussing the format. Our VS Code and IntelliJ plugins should reference it in their own docs and our docs in openfga.dev should be a mirror of it.

Originally posted by @rhamzeh in #369 (comment)