Document API usage

[cmahnke]

For inclusion in larger workflows or a custom program, it might be worthwhile to be able to use the functionality using the regular Python import semantics.
Can you please provide an example how to use that?

Basic examples will be sufficient:

• Importing as a library
• Doing basic parsing into a Pythion dict
• Transforming a string or file into Markdown / HTML

[github-actions]

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