Add ESM example of rc file

[ludofischer]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

I've added an example of the syntax for an ESM configuration file. I hope it's correct, I have found it by trial and error :joy: ( I was not sure whether to use default export or a named export for every file as on issue https://github.com/remarkjs/remark/issues/654)

[ludofischer]

There's TypeScript errors that also happen on the main branch.

[codecov-commenter]

Codecov Report

Merging #54 (1998422) into main (8d73245) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #54   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         2505      2513    +8     
=========================================
+ Hits          2505      2513    +8     

Impacted Files	Coverage Δ
lib/configuration.js	100.00% <0.00%> (ø)
lib/file-pipeline/parse.js	100.00% <0.00%> (ø)
lib/file-pipeline/configure.js	100.00% <0.00%> (ø)

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[wooorm]

Thanks!

[github-actions[bot]]

Hi! This was closed. Team: If this was merged, please describe when this is likely to be released. Otherwise, please add one of the no/* labels.