A nushell plugin to convert data to nushell tables.

1. from eml - original ported from nushell core.
2. from ics - original ported from nushell core.
3. from ini - original ported from nushell core.
4. from vcf - original ported from nushell core.

nushell, It's a nushell plugin, so you need it.

1. compile the binary: cargo build
2. plugin add plugin(assume it's compiled in ./target/debug/):

plugin add ./target/debug/nu_plugin_formats