Add an example for docgen-api or json output

Hi, thanks for the nice work.

I installed docgen-api with npm. But when I use parse, it throws Can't resolve all kinds of modules.

I can not run docgen-api correctly.

I can use docgen-cli to out docs. But I do not need the doc. I just want the parsed object.

Could add an example with docgen-api or add an example for json output (just make the parsed object into json).

Thanks.

[wakaryry]

@elevatebart Thanks a lot. It really helps me.

[elevatebart]

Is this what you had in mind ? https://github.com/elevatebart/docgen-api-example