A plugin to add KDL support to Nushell.

./cargo-setup.nu /path/to/nushell/nushell/

cargo build --release

register target/release/nu_plugin_kdl

see examples.md

• implement from kdl and support in open foo.kdl
• implement to kdl and support in save foo.kdl
• add tests
• add proper error support
• support type annotations
• preserve comments