Html2text-rs

* [Add text_rich()](https://github.com/deedy5/html2text_rs/commit/61425605b282dbcb06d3bacc8e36185fddf222eb)
* [Create LICENSE](https://github.com/deedy5/html2text_rs/commit/eb8a14d1bf5e01731f128963e7fe346c5392eaeb)

**Full Changelog**: https://github.com/deedy5/html2text_rs/compare/v0.1.0...v0.2.0

Implemented def `text_markdown()` and `text_plain()`

COMMITS:
* [Initial commit](https://github.com/deedy5/html2text_rs/commit/f20f86023e8b3d4b69e4d52dbc69dc574b03ce64)
* [add pytest](https://github.com/deedy5/html2text_rs/commit/4d05e4e2427a5a1a629963559bc17325e55aa146)

**Full Changelog**: https://github.com/deedy5/html2text_rs/commits/v0.1.0