A rust library for Betacode conversion

Usage:

```{rust} use betacode::converter;

let input = String::from("mh=nin a)/eide qea\ *phlhi+a/dew *a)xilh=os"); let output = String::from("μῆνιν ἄειδε θεὰ Πηληϊάδεω Ἀχιλῆος"); let result = betacode::converter::convert(input); assert_eq!(result, output); ```