Time to expand our developer documentation, as some of this is still
tribal knowledge or things could otherwise slip through the cracks and
are costly to fix later.
This is still work in progress. But let's start somewhere.
Goal for this being in the repo is to make sure we update it more
frequently than the
https://github.com/nushell/nushell.github.io/tree/main/contributor-book
- Add folder for in-repo developer documentation
- Move PLATFORM_SUPPORT into devdocs
- Move our rust style to devdocs
- Use nushell code formatting in CONTRIBUTING
- Add FAQ file for developers with example questions
- Describe error handling best practices
