README

Generate catalog of README.md on Github Repo.

Example

cargo run -- Example.md

will generate content below in stdout:

- [Example](#example)
  - [Subtitle0](#subtitle0)
    - [sub sub title](#sub-sub-title)
  - [Subtitle 1](#subtitle-1)
  - [Subtitle 2](#subtitle-2)

cargo run -- -d 1 ./Example.md

- [Subtitle0](#subtitle0)
  - [sub sub title](#sub-sub-title)
- [Subtitle 1](#subtitle-1)
- [Subtitle 2](#subtitle-2)

cargo run -- -d 2 ./Example.md

- [sub sub title](#sub-sub-title)